wiki search error %p

[hi5]

When you search for %n in the wiki you get results, if you search for %p I get an error (at the moment) which seems a bit strange (%n working, %p not) -- error message:

[ZKh980ZmO-@CbCVYYVNpNQAAAE8] 2023-07-07 21:04:51: Fatal exception of type "Wikimedia\Assert\PreconditionException"

[white]

Confirmed. I think searching for %p is the same as searching for p.
It only happens for the English wiki and only when the search includes searching in the main namespace. So perhaps it is a problem with 1 page, but which one?
Searching for any other letter works OK as well as searching for p in combination with any letter in front of or behind it.

[ghisler(Author)]

It's a currently open bug in the WikiMedia software, see:
https://phabricator.wikimedia.org/T302812