When trying to view the deleted revisions of https://de.wikipedia.org/wiki/Wikipedia:Spielwiese, I get the following error. The actual error is T249977.
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Description
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The message string is used in MWExceptionRenderer::getCustomMessage with Message::text, which does transform of {{ and that includes plural.
I am not sure, if due to time out the parser step is skipped in exception handling
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Yeah, actually the {{SITENAME}} in searchbar also doesn't get transformed.
Also this doesn't seem to be deterministic, sometimes it does work.
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The fact that it affects the search bar as well suggests to me that this isn't an issue with how Rdbms communicates the information to core.
Untagging Rdbms as such, though I'd be happy to help guide anyone interested in improving or addressing this. It's a fairly easy task I think, and makes for a good intro.