Tested with Google Chrome 84. Seems to have started in `1.36.0-wmf.3`/271fb28d99c5
1. Visit the desktop site https://www.mediawiki.org/wiki/Special:AbuseLog
** Observe the form starts in collapsed state.
** Click on the form header 'search the abuse log'
** Observe the form expanded.
2. Now visit the mobile site https://m.mediawiki.org/wiki/Special:AbuseLog
** Observe the form starts in expanded state (the code says otherwise should happen)
** Now click on the form header
** Observe that nothing happens, the form fails to collapse
3. Visit another mobile site https://m.mediawiki.org/wiki/Special:Contributions/Jdlrobson with AMC enabled
** Observe the form starts in collapsed state.
** Click on the form header
** Observe nothing happens, the form fails to expand
Note: You need AMC mode enabled for the mobile links above.
Seems to be regression from T257265/T250851
Related: T257127
== QA Results - Beta
| **AC** | **Status** | **Details** |
| ----- | ----- | ----- |
| 1 | ✅ | T260642#6461094 |
| 2 | ✅ | T260642#6461094 the observed behavior is acceptable per T260642#6484520 |
| 3 | ✅ | T260642#6461094 |
== QA Results - Prod
| **AC** | **Status** | **Details** |
| ----- | ----- | ----- |
| 1 | ✅ | T260642#6499304 |
| 2 | ✅ | T260642#6499304 the observed behavior is acceptable per T260642#6484520 |
| 3 | ✅ | T260642#6504873 |