Is there a limit on the number of tags after which searching using intags:mine no longer works?

On a local meta a user complained that this search is not working for him. Since this user has many ignored tags, it was suggested in the comments that a limit on number of ignored tags might be a problem.

After he provided the list of his favorite and ignored tags, I have tried to use those tags to see whether I can replicate the problem. As I was adding the ignored tags, I found out that at a certain point the search indeed stopped working. (I have posted details, as an answer on the local meta.) If I counted correctly, the search worked until there was 1023 ignored tags. Since this is quite close to a round number, this supports the suspicion that limit might be in play here. Still, it would be nice to have this confirmed officially, if it's indeed the case.



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