diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 77bbe972..db99a2a3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -689,16 +689,16 @@ jobs:
           echo '${{ toJSON(steps.changed-files-json.outputs.all_changed_files) }}'
         shell:
           bash
-      - name: Run changed-files with json raw format
-        id: changed-files-json-raw-format
+      - name: Run changed-files with json unescaped format
+        id: changed-files-json-unescaped
         uses: ./
         with:
           json: true
-          json_raw_format: true
+          escape_json: false
       - name: Show output
         run: |
-          echo '${{ toJSON(steps.changed-files-json-raw-format.outputs) }}'
-          echo '${{ toJSON(steps.changed-files-json-raw-format.outputs.all_changed_files) }}'
+          echo '${{ toJSON(steps.changed-files-json-unescaped.outputs) }}'
+          echo '${{ toJSON(steps.changed-files-json-unescaped.outputs.all_changed_files) }}'
         shell:
           bash
       - name: Run changed-files with comma separator
diff --git a/dist/index.js b/dist/index.js
index 6343d593..701bc032 100644
Binary files a/dist/index.js and b/dist/index.js differ
diff --git a/dist/index.js.map b/dist/index.js.map
index 6982409d..ab76fb5e 100644
Binary files a/dist/index.js.map and b/dist/index.js.map differ
diff --git a/src/commitSha.ts b/src/commitSha.ts
index 9bece7c0..cb932c9c 100644
--- a/src/commitSha.ts
+++ b/src/commitSha.ts
@@ -137,7 +137,7 @@ export const getSHAForPushEvent = async (
     }
 
     await verifyCommitSha({sha: previousSha, cwd: workingDirectory})
-    core.info(`Previous SHA: ${previousSha}`)
+    core.debug(`Previous SHA: ${previousSha}`)
 
     return {
       previousSha,
@@ -177,10 +177,6 @@ export const getSHAForPushEvent = async (
       core.debug('Getting previous SHA for last remote commit...')
       if (env.GITHUB_EVENT_FORCED === 'false' || !env.GITHUB_EVENT_FORCED) {
         previousSha = env.GITHUB_EVENT_BEFORE
-      } else {
-        previousSha = await getParentSha({
-          cwd: workingDirectory
-        })
       }
 
       if (
@@ -190,6 +186,19 @@ export const getSHAForPushEvent = async (
         previousSha = await getParentSha({
           cwd: workingDirectory
         })
+      } else if (
+        (await verifyCommitSha({
+          sha: previousSha,
+          cwd: workingDirectory,
+          showAsErrorMessage: false
+        })) !== 0
+      ) {
+        core.warning(
+          `Previous commit ${previousSha} is not valid. Using parent commit.`
+        )
+        previousSha = await getParentSha({
+          cwd: workingDirectory
+        })
       }
 
       if (previousSha === currentSha) {
@@ -322,7 +331,7 @@ export const getSHAForPullRequestEvent = async (
     }
 
     await verifyCommitSha({sha: currentSha, cwd: workingDirectory})
-    core.info(`Previous SHA: ${previousSha}`)
+    core.debug(`Previous SHA: ${previousSha}`)
 
     return {
       previousSha,
diff --git a/src/env.ts b/src/env.ts
index dd59eaa5..02226c70 100644
--- a/src/env.ts
+++ b/src/env.ts
@@ -41,6 +41,7 @@ export const getEnv = async (): Promise<Env> => {
   if (eventPath) {
     eventJson = JSON.parse(await fs.readFile(eventPath, {encoding: 'utf8'}))
   }
+  core.debug(`Env: ${JSON.stringify(process.env, null, 2)}`)
   core.debug(`Event: ${JSON.stringify(eventJson, null, 2)}`)
 
   return {
diff --git a/src/inputs.ts b/src/inputs.ts
index 75625b51..bca5e600 100644
--- a/src/inputs.ts
+++ b/src/inputs.ts
@@ -135,7 +135,7 @@ export const getInputs = (): Inputs => {
   }
 
   if (fetchDepth) {
-    inputs.fetchDepth = parseInt(fetchDepth, 10)
+    inputs.fetchDepth = Math.max(parseInt(fetchDepth, 10), 2)
   }
 
   if (dirNamesMaxDepth) {
diff --git a/src/utils.ts b/src/utils.ts
index fe45c905..522edbb9 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -93,7 +93,7 @@ export const verifyMinimumGitVersion = async (): Promise<void> => {
   const {exitCode, stdout, stderr} = await exec.getExecOutput(
     'git',
     ['--version'],
-    {silent: process.env.ACTION_DEBUG === 'false'}
+    {silent: process.env.RUNNER_DEBUG !== '1'}
   )
 
   if (exitCode !== 0) {
@@ -177,7 +177,7 @@ export const updateGitGlobalConfig = async ({
     ['config', '--global', name, value],
     {
       ignoreReturnCode: true,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -193,7 +193,7 @@ export const isRepoShallow = async ({cwd}: {cwd: string}): Promise<boolean> => {
     ['rev-parse', '--is-shallow-repository'],
     {
       cwd,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -211,7 +211,7 @@ export const submoduleExists = async ({
     {
       cwd,
       ignoreReturnCode: true,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -232,7 +232,7 @@ export const gitFetch = async ({
   const {exitCode} = await exec.getExecOutput('git', ['fetch', '-q', ...args], {
     cwd,
     ignoreReturnCode: true,
-    silent: process.env.ACTION_DEBUG === 'false'
+    silent: process.env.RUNNER_DEBUG !== '1'
   })
 
   return exitCode
@@ -251,7 +251,7 @@ export const gitFetchSubmodules = async ({
     {
       cwd,
       ignoreReturnCode: true,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -276,7 +276,7 @@ export const getSubmodulePath = async ({
     {
       cwd,
       ignoreReturnCode: true,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -309,7 +309,7 @@ export const gitSubmoduleDiffSHA = async ({
     ['diff', parentSha1, parentSha2, '--', submodulePath],
     {
       cwd,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -362,7 +362,7 @@ export const gitRenamedFiles = async ({
     {
       cwd,
       ignoreReturnCode: true,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -434,7 +434,7 @@ export const gitDiff = async ({
     {
       cwd,
       ignoreReturnCode: true,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -486,7 +486,7 @@ export const gitLog = async ({
 }): Promise<string> => {
   const {stdout} = await exec.getExecOutput('git', ['log', ...args], {
     cwd,
-    silent: process.env.ACTION_DEBUG === 'false'
+    silent: process.env.RUNNER_DEBUG !== '1'
   })
 
   return stdout.trim()
@@ -495,7 +495,7 @@ export const gitLog = async ({
 export const getHeadSha = async ({cwd}: {cwd: string}): Promise<string> => {
   const {stdout} = await exec.getExecOutput('git', ['rev-parse', 'HEAD'], {
     cwd,
-    silent: process.env.ACTION_DEBUG === 'false'
+    silent: process.env.RUNNER_DEBUG !== '1'
   })
 
   return stdout.trim()
@@ -513,7 +513,7 @@ export const gitLsRemote = async ({
     ['ls-remote', 'origin', ...args],
     {
       cwd,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
   const output = stdout.trim().split('\t')
@@ -531,7 +531,7 @@ export const getParentSha = async ({cwd}: {cwd: string}): Promise<string> => {
     ['rev-list', '-n', '1', 'HEAD^'],
     {
       cwd,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -553,7 +553,7 @@ export const verifyCommitSha = async ({
     {
       cwd,
       ignoreReturnCode: true,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -583,7 +583,7 @@ export const getPreviousGitTag = async ({
     ['tag', '--sort=-version:refname'],
     {
       cwd,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -601,7 +601,7 @@ export const getPreviousGitTag = async ({
     ['rev-parse', previousTag],
     {
       cwd,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )
 
@@ -627,7 +627,7 @@ export const canDiffCommits = async ({
     {
       cwd,
       ignoreReturnCode: true,
-      silent: process.env.ACTION_DEBUG === 'false'
+      silent: process.env.RUNNER_DEBUG !== '1'
     }
   )