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Visual artifact on pistons
Client version: 1.12.2 Server OS: Windows 11 Cuberite Commit id: 95bc2eac222a12c049b1aef799ac280fa9123af4
Expected behavior
When two pistons extend and retract in the same block really fast, one of them will "take the priority" and the other one will stay retracted.
Actual behavior
When doing this for long enough, you can see an artifact appearing on one of the pistons. One of them will have its extended block disappear. This is client-sided.

Steps to reproduce the behavior
Reproduce the setup shown in the image.