- Make sure Special:NewPagesFeed has AfC enabled
- In NPP mode, open the filters popup, remove all checkboxes; note: The 'Set filters' button is disabled
- Without clicking anything else or applying anything, click the "AfC" option to switch to AfC mode
- Switch back to NPP mode
Expected: The invalid options (the state where 'set filters' button was disabled) should have been ignored, and we should have the filters that were there before, or default filters.
Actual result: The filters are now on empty state, which is invalid, and NPP shows no articles at all.