There is a bug where pages that start with numbers end up getting put under headers on the category pages that consist of weird Unicode characters, rather than the appropriate number. I don't have an example of this offhand, but it is mentioned at T8948#1919137. I think this only happens under ICU collation, but need to verify.
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It would be for icu collation modified to use numeric sorting. It might depend on version of libicu. Im more assuming it happens. Havent really tested
It would be caused by a mismatch in the logic of firstLetterHeader over how numbers sort at a primary strength.
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Since we don't have a reliable way to reproduce this at the moment, I'm going to switch the blocking order.