So it turns out one mixin already was BE instead of TE

Therefore reverted it to BE again

src/main/java/carpet/mixins/BlockEntity_movableBEMixin.java

@@ -9,7 +9,7 @@ import org.spongepowered.asm.mixin.Mutable;
 import org.spongepowered.asm.mixin.Shadow;
 
 @Mixin(BlockEntity.class)
-public abstract class BlockEntity_movableTEMixin implements BlockEntityInterface
+public abstract class BlockEntity_movableBEMixin implements BlockEntityInterface
 {
     @Mutable
     @Shadow @Final protected BlockPos worldPosition;

src/main/resources/carpet.mixins.json

@@ -207,7 +207,7 @@
     "NoiseColumnSamplerMixin_scarpetMixin",
     "CaveScalerMixin_scarpetMixin",
 
-    "BlockEntity_movableTEMixin",
+    "BlockEntity_movableBEMixin",
     "PistonBlock_movableTEMixin",
     "PistonBlockEntity_movableTEMixin",
     "World_movableTEMixin",