No other flavor can be selected anymore on DW other than the first flavor selected

STEPS TO REPRODUCE

1. Unzip a fresh instance of XWiki (e.g. 12.4RC1 or 11.10.5)
2. Delete 'data' folder (if exists, in case the version has the Standard flavor preinstalled)
3. Start XWiki
4. When DW is displayed, click 'Continue'
5. Fill Admin credentials
6. Click 'Register and login' > 'Continue'
7. On Step 2 select a flavor (e.g. Standard flavor)
8. Click 'Install this flavor'
9. Click 'Select other flavor'
10. Select Demo flavor
11. Click 'Install this flavor'

EXPECTED RESULTS

The currently selected flavor to be installed is Demo flavor, as was selected last.

ACTUAL RESULTS

The selected flavor is still Standard flavor (no matter if the selection of Demo flavor is repeated). The same happens also if Demo flavor is selected first, then the Standard flavor cannot be selected anymore.

Tested and reproduced also on XWiki 11.10.5.

The issue could not be reproduced on XWiki 10.11.9.