Are you sure this has anything to do with the watchlist status? It really shouldn't make a difference. I believe what you're seeing instead is T192085 which leads to some changes not showing up in the watchlist. Could you please check?

@Lydia_Pintscher We could easily test it. I've removed Q1292076 from my Wikidata watchlist. Please add the following labels in English:

• Q1292076: Márton Sturman
• Q26844250: Tamás Stark

If I don't spot Q26844250 (Wikidata+locally watched) but see Q1292076 (ony locally watched) on my huWiki watchlist, then the bug is real.

This is a x/y problem. I make a fix right away.

Change 428985 had a related patch set uploaded (by Ladsgroup; owner: Amir Sarabadani):
[mediawiki/extensions/Wikibase@master] AffectedPagesFinder need to find pages when the aspect without modifier is used

https://gerrit.wikimedia.org/r/428985

In T192673#4159130, @Ladsgroup wrote:

This is a x/y problem. I make a fix right away.

What do you mean under x/y problem? I'd like to learn. :)

I mean XY problem. The real reason behind this is actually something else that I'm working on a fix for that.

Change 428985 merged by jenkins-bot:
[mediawiki/extensions/Wikibase@master] AffectedPagesFinder need to find pages when the aspect without modifier is used

https://gerrit.wikimedia.org/r/428985