Context:

Mod Versions:

• CreativeCore_v1.9.62_mc1.12.2

• LittleTiles_v1.5.0-pre158_mc1.12.2

• Door before opening
  

• Door after opening

Note: Works in preview but gives java.lang.StackOverflowError: Exception in server tick loop when opening the door as an object in game.

• The main door consists of the 18 grey rectangles, the orange door, and a white strip in the front.
• The grey rectangles and the orange door are children of a small white strip in the front.

• The grey rectangles rotate Z +1800 degrees and forward +6 Z on a 32 grid then goes down to their respected locations. They all activate at 20 tick intervals apart and are children of the white strip in the back as shown below.
  

• This is the orange door by itself (It does not have any children).
  

Crash Report:
crash-2019-08-16_19.43.22-server.txt

The Door (Used little exporter):
Orange Door with Grey Screws.txt

I hope I provided enough information for you to resolve this issue. Please let me know if you need more. I am happy to help if needed :)

Will be fixed in the upcoming version as well, unfortunately some other issues appeared, which are rather minor (just some rendering glitches). Hope I can fix them as well.

It's out!