This problem coincides with deployment of MediaWiki 1.35/wmf.14 today, but I find nothing obviously connected in the changelog. A few changes mention touching calls to int(), but not in any context that would obviously be connected to this issue.

Also judging by change log, this is not a ProofreadPage issue (no changes to PP this release). @Aklapper can you suggest better/other projects to make sure the right people see this?

Judging by on-wiki reports this affects all the Wikisourcen.

T242425: Wikidata shows different image (file) sizes, than Commons reports for the current version seems similar/related

In T242422#5792892, @Xover wrote:

This problem coincides with deployment of MediaWiki 1.35/wmf.14 today, but I find nothing obviously connected in the changelog. A few changes mention touching calls to int(), but not in any context that would obviously be connected to this issue.

Maybe, just non-integer image sizes are new feature (unsure if it is intentional) that canoot be handled properly by Proofreadpage

In T242422#5792913, @Reedy wrote:

T242425: Wikidata shows different image (file) sizes, than Commons reports for the current version seems similar/related

I do not think so. The actual file mentioned in that task has integer sizes; the non-integer values most likely originate from an older, outdated file version. So that is rather some problem with caching outdated values than with non-integer sizes. Just accidentally noticed at the same time.

T242517 seems to have fixed the problem. I believe that we could close this task. I don't see the point for ProofreadPage to have a workaround for this bug that is now solved and affects other parts of the MediaWiki platform.

@Ankry Please do so if you agree.