Describe the bug
When running actions/github-script v8 with Fine Grained PAT token , I get an HTTP 500 Error. However when I switch to a classic PAT token, I do not get an error.

Furthermore, when I was working with actions/github-script v7.0.1, the my yml code worked with a Fine Grained PAT token. In the documentation, it says that they v8 supports Fine Grained PAT token. My runner version is 2.329.0, could the issue be with Octokit ?

My yml code :

name: Trigger_system_pipeline

on:
schedule:
- cron: '0 15 * * 1' # Runs every Monday at 15:00 UTC (8:00 AM MT)
workflow_dispatch:

permissions:
actions: write
contents: read

jobs:
check-second-monday:
runs-on: ubuntu-latest
outputs:
run: ${{ steps.check.outputs.run }}

steps:
 - name: Check if today is the second Monday of the month
 id: check
 run: |
 TODAY=$(date -u +"%Y-%m-%d")
 YEAR=$(date -u +%Y)
 MONTH=$(date -u +%m)
 FIRST_DAY="$YEAR-$MONTH-01"
 FIRST_DAY_WEEKDAY=$(date -u -d "$FIRST_DAY" +%u)
 if [ "$FIRST_DAY_WEEKDAY" -eq 1 ]; then
 FIRST_MONDAY="$FIRST_DAY"
 else
 DAYS_TO_ADD=$(( (8 - FIRST_DAY_WEEKDAY) % 7 ))
 FIRST_MONDAY=$(date -u -d "$FIRST_DAY +$DAYS_TO_ADD days" +%Y-%m-%d)
 fi
 SECOND_MONDAY=$(date -u -d "$FIRST_MONDAY +7 days" +%Y-%m-%d)
 echo "Today: $TODAY"
 echo "Second Monday: $SECOND_MONDAY"
 if [[ "$TODAY" == "$SECOND_MONDAY" ]]; then
 echo "run=true" >> $GITHUB_OUTPUT
 else
 echo "run=false" >> $GITHUB_OUTPUT
 fi

trigger-ingestion-workflow:
needs: check-second-monday
if: needs.check-second-monday.outputs.run == 'true' || github.event_name == 'workflow_dispatch'
runs-on: ubuntu-latest
steps:
- name: Trigger ML system dynamically with retry
uses: actions/github-script@v8
with:
github-token: ${{ secrets.FINE_GRAINED_PAT_TOKEN}}
script: |
const { data: workflows } = await github.rest.actions.listRepoWorkflows({
owner: '##',
repo: '###'
});

 const targetWorkflow = workflows.workflows.find(wf =>
 wf.name === 'Update_data_pipeline_ci_cd.yml' ||
 wf.path.endsWith('Update_data_pipeline_ci_cd.yml')
 );
 if (!targetWorkflow) {
 core.setFailed('Workflow not found');
 return;
 }
 // Log workflow state
 console.log(`Workflow state: ${targetWorkflow.state}`);
 if (targetWorkflow.state !== 'active') {
 core.setFailed(`Workflow ${targetWorkflow.name} is not active`);
 return;
 }
 console.log(`Found workflow: ${targetWorkflow.name} (ID: ${targetWorkflow.id})`);
 const maxRetries = 3;
 for (let attempt = 1; attempt <= maxRetries; attempt++) {
 try {
 await github.rest.actions.createWorkflowDispatch({
 owner: '##',
 repo: '###',
 workflow_id: targetWorkflow.id,
 ref: 'main'
 });
 console.log('Workflow dispatch triggered successfully.');
 break;
 } catch (error) {
 console.error(`Attempt ${attempt} failed: ${error.message}`);
 console.error(`Full error: ${JSON.stringify(error)}`);
 if (attempt === maxRetries) {
 core.setFailed('Failed to trigger workflow after multiple attempts.');
 } else {
 console.log('Retrying in 5 seconds...');
 await new Promise(r => setTimeout(r, 5000));
 }
 }
 }

The return error :

Run actions/github-script@v8
Workflow state: active
Found workflow: Update_data_pipeline (ID: 196328636)
Attempt 1 failed: fetch failed
Retrying in 5 seconds...
Full error: {"name":"HttpError","status":500,"request":{"method":"POST","url":"https://api.github.com/repos/##/###/actions/workflows/196328636/dispatches","headers":{"accept":"application/vnd.github.v3+json","user-agent":"actions/github-script octokit-core.js/5.0.1 Node.js/24","authorization":"token [REDACTED]","content-type":"application/json; charset=utf-8"},"body":"{"ref":"main"}","request":{"agent":{"_events":{},"_eventsCount":2,"options":{"keepAlive":true,"scheduling":"lifo","timeout":5000,"defaultPort":443,"protocol":"https:","noDelay":true,"path":null},"defaultPort":443,"protocol":"https:","requests":{},"sockets":{},"freeSockets":{},"keepAliveMsecs":1000,"keepAlive":true,"maxSockets":null,"maxFreeSockets":256,"scheduling":"lifo","maxTotalSockets":null,"totalSocketCount":0,"agentKeepAliveTimeoutBuffer":1000,"maxCachedSessions":100,"_sessionCache":{"map":{},"list":[]}}}}}
Attempt 2 failed: fetch failed
Full error: {"name":"HttpError","status":500,"request":{"method":"POST","url":"https://api.github.com/repos##/###/actions/workflows/196328636/dispatches","headers":{"accept":"application/vnd.github.v3+json","user-agent":"actions/github-script octokit-core.js/5.0.1 Node.js/24","authorization":"token [REDACTED]","content-type":"application/json; charset=utf-8"},"body":"{"ref":"main"}","request":{"agent":{"_events":{},"_eventsCount":2,"options":{"keepAlive":true,"scheduling":"lifo","timeout":5000,"defaultPort":443,"protocol":"https:","noDelay":true,"path":null},"defaultPort":443,"protocol":"https:","requests":{},"sockets":{},"freeSockets":{},"keepAliveMsecs":1000,"keepAlive":true,"maxSockets":null,"maxFreeSockets":256,"scheduling":"lifo","maxTotalSockets":null,"totalSocketCount":0,"agentKeepAliveTimeoutBuffer":1000,"maxCachedSessions":100,"_sessionCache":{"map":{},"list":[]}}}}}
Retrying in 5 seconds...
Attempt 3 failed: fetch failed
Full error: {"name":"HttpError","status":500,"request":{"method":"POST","url":"https://api.github.com/repos/##/###/actions/workflows/196328636/dispatches","headers":{"accept":"application/vnd.github.v3+json","user-agent":"actions/github-script octokit-core.js/5.0.1 Node.js/24","authorization":"token [REDACTED]","content-type":"application/json; charset=utf-8"},"body":"{"ref":"main"}","request":{"agent":{"_events":{},"_eventsCount":2,"options":{"keepAlive":true,"scheduling":"lifo","timeout":5000,"defaultPort":443,"protocol":"https:","noDelay":true,"path":null},"defaultPort":443,"protocol":"https:","requests":{},"sockets":{},"freeSockets":{},"keepAliveMsecs":1000,"keepAlive":true,"maxSockets":null,"maxFreeSockets":256,"scheduling":"lifo","maxTotalSockets":null,"totalSocketCount":0,"agentKeepAliveTimeoutBuffer":1000,"maxCachedSessions":100,"_sessionCache":{"map":{},"list":[]}}}}}
Error: Failed to trigger workflow after multiple attempts.

However, when I change one line from the yml code to the following(which switches from the Fine grained PAT token to the Classic PAT token ), it works :
github-token: ${{ secrets.CLASSIC_PAT_TOKEN }}

Any help would be appreciated it !

Thank you