May be you should not accept my answer as this has not resolved your issue.
Check the atlassian-jira.log, search for 'modified files' and find if you have customized any files. Haven't seen such a file before.
And most important, what does the file contain? Can you post a portion of the file?
The roof is on FIRE… network outages, broken processes, upset clients and employees. Each day seemed to bring more and more issues. Incidents were communicated via email, messengers (skype or teams) ...
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