In my 1,13-pre9 world, which was generated in 1.13-pre8, I have found some bugged giant mushrooms.
I found an unusually tall brown mushroom (is this normal?) and a red mushroom that generated with half of it missing.
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One issue per report, please.
As for the first, that's been intended since 1.10, and the second is a duplicate of MC-125637.

Oh sorry! I just joined this community today since I'm trying the pre-patch content. I'll do better next time. Thanks for your response!