This could be reproduced (most of the time) with Chrome ranging from version 93 to 95. When opening a popup, that contains a search-bar that is styled with "form-control", the input will sometimes disappear when focused. This happened always. after a search has been executed.
Steps to reproduce:
- Use Chrome
- Open any pop-up dialog that contains a search-bar, for example the Related-Assets-Selection-Dialog in the article-edit-form
- Search for anything
- Click into the input-field to focus it. If its still visible, try clicking somewhere else and then focusing the input again.
The following style might be responsible for this behaviour:
Disabling the z-index makes the input appear normal again.