Placing a brittle redstone power source on top of a cart assembler crashes the game

[vercte]

Context

My server players found this. Required a reset of the entities for that region. Reproducible with just Sable and Create (and JEI, but I don't think that matters here). This does not occur with only Create installed.

java.April.30.at.18.48.mp4

latest.log: https://mclo.gs/oTiRVA3

Crash Report

https://mclo.gs/SkvUe8A

[Looxond]

ye can confirm

https://mclo.gs/toGCbOL

Minecraft.NeoForge_.1.21.1.-.Singleplayer.2026-04-30.21-35-50.mp4