We have recently migrated our gitlab self-managed instance to a new server and then upgraded the gitlab version to that latest version 13.8.2 using the recommended upgrade path below.
From: source version → 12.7.2-ee.0
intermediate version → 12.10.14-ee.0
intermediate version → 13.0.14-ee.0
To: final/target version → 13.8.2
Since the upgrade, all the dropdown menus stopped working.
I have found an old forum below that discussed about the same issue. But there was no clear resolution.
Have anyone of you come across this issue during the upgrade and if so, were you able to resolve it? Please Advise. Thank you for your support.