fix: getTE when crossing chunk (#7822)

Co-authored-by: UltraProdigy <187078471+UltraProdigy@users.noreply.github.com>

Author: Caedis

src/main/java/gregtech/api/metatileentity/BaseTileEntity.java

@@ -439,14 +439,17 @@ public TileEntity getTileEntity(int x, int y, int z) {
     @Override
     public final TileEntity getTileEntityAtSide(ForgeDirection side) {
         final int ordinalSide = side.ordinal();
-        if (side == ForgeDirection.UNKNOWN || mBufferedTileEntities[ordinalSide] == this) return null;
+        if (side == ForgeDirection.UNKNOWN) return null;
         final int tX = getOffsetX(side, 1);
         final int tY = getOffsetY(side, 1);
         final int tZ = getOffsetZ(side, 1);
         if (crossedChunkBorder(tX, tZ)) {
+            // never trust the "nothing here" marker across a chunk border
+            // loading the neighbor chunk fires no block update
+            // the marker would stick forever and we would never see its tile entities.
             mBufferedTileEntities[ordinalSide] = null;
             if (ignoreUnloadedChunks && !worldObj.blockExists(tX, tY, tZ)) return null;
-        }
+        } else if (mBufferedTileEntities[ordinalSide] == this) return null;
         if (mBufferedTileEntities[ordinalSide] == null) {
             mBufferedTileEntities[ordinalSide] = worldObj.getTileEntity(tX, tY, tZ);
             if (mBufferedTileEntities[ordinalSide] == null) {