List of steps to reproduce (step by step, including full links if applicable):
- disable the "Enable the editing toolbar" in Preferences -> Editing
- edit any page in the Page namespace in Wikisource using standard wikicode editor
What happens?:
- scan appears for a while in the right-half of the screen and then disappears leaving blue square in its expected location
- no error reported in console
What should have happened instead?:
- The scan should remain in the right part of the screen (assuming the default, vertical mode is used)
Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc:
The problem did not exist before 2021-12-08
Tested on Firefox, but probably browser does not matter