When dragging a Shulkerbox in your inventory that is filled with buckets of tropical fish it will cause your game a substantial amount of lag. I encountered the bug as I was collecting fish for an aquarium and when my box was only half full my game lagged severely, which I had assumed was just a fluke until I tried again later.
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[Mod] OcelotOnesie
migrated
Thank you for your report!
We're tracking this issue in MCPE-27167, so this ticket is being resolved and linked as a duplicate.
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