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"No label defined" incorrectly shown in the page title after merging
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Description

I have my UI language set to English. Today I merged several items which had English labels into items which did not have English labels. I noticed at least 4 times that, after the merge, the page title (the one just above the table with the labels/descriptions/aliases) still showed "No label defined" instead of the English label. Refreshing the page didn't help, only purging the page fixed it.

I'm not sure if it happens every single time, but I was also able to reproduce it on test.wikidata.org on my first try at https://test.wikidata.org/wiki/Q2426

Event Timeline

Here's a screenshot of what I mean:

nolabeldefined.png (187×948 px, 13 KB)

(Edit: I seem to have taken a screenshot of the wrong page, but other than the last digit of the ID, it looks exactly the same anyway.)

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I'm not sure if it's the same as that or not, I haven't noticed any strange behaviour in the table, only in the heading above it.

I just got something similar after doing a rollback (this edit), the heading showed the old value, the table showed the new value:

beethoven.png (274×945 px, 22 KB)

(I've already purged the page to fix it since this isn't some obscure item)