Fix multiblock strcuture checking

[Yefancy]

What

This mixin is used to notify structure changes for multiblock. I added it based on vanilla code before, because gtm was based on multiple platform.

I didn't notice that the forge modifies LevelChunk code. They add a new feature (captureBlockSnapshots) to speed up blockstate updates. However, it will block multiblock strcuture validation checking in some cases.

There is no problem when breaking blocks, but nomore checking when placing blocks into structures.
I am surprised that this bug has not had an impact for so long. (Mainly, the act of placing blocks in pattern is barely(never) happens for multiblocks of gtm)

Implementation Details

original mixin injection:

if (!this.level.isClientSide && !this.level.captureBlockSnapshots) {
    // <!-here>
    state.onPlace(this.level, pos, blockstate, isMoving);
}

if (state.hasBlockEntity()) {
    // ......
}

new injection:

if (!this.level.isClientSide && !this.level.captureBlockSnapshots) {
    state.onPlace(this.level, pos, blockstate, isMoving);
}

// <!-here>
if (state.hasBlockEntity()) {
    // ......
}

[screret]

could you also remove https://github.com/GregTechCEu/GregTech-Modern/blob/1.20.1/src/main/java/com/gregtechceu/gtceu/core/mixins/ForgeHooksMixin.java ?

[screret]

also, spotless.

[Yefancy]

could you also remove https://github.com/GregTechCEu/GregTech-Modern/blob/1.20.1/src/main/java/com/gregtechceu/gtceu/core/mixins/ForgeHooksMixin.java ?

oh, it got fixed. its also fine to keep current version.