Steps to reproduce
- Enable the preference "Group changes by page in recent changes and watchlist"
- Access Special:Log/delete and add three of the most recently deleted pages to your watchlist
- Go to Special:Watchlist?uselang=pt
The logs are grouped and collapsed in a single line, and there is a triangle on the left to allow you to expand the collapsed content. This is what happens if you change the user language to English (en):
The logs are grouped and collapsed in a single line, BUT there is NO way to expand the collapsed content.
For some reason, the links to show the hidden lines on Watchlist is not visible for users of Portuguese wikis who use the default language (pt).
The problem does not happens on English Wikipedia anymore, only on ptwiki (maybe others too). Tested with Firefox.