User tests: Successful: Unsuccessful:
Any field that extends the groupedlist field ends up with two class=custom-select
This can be seen on the
and various other places
note: you need to view source - not inspect source to see this
When testing please check all select based fields - it should be easy as without any class=custom-select it will visually look wrong
| Status | New | ⇒ | Pending | 
| Category | ⇒ | Libraries | 
doh
| Status | Pending | ⇒ | Closed | 
| Closed_Date | 0000-00-00 00:00:00 | ⇒ | 2018-07-06 09:34:38 | 
| Closed_By | ⇒ | brianteeman | |
| Labels | 
                                        Added: 
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Duplicate PR #20196.