And here is a picture of this happening:

If I stand closer or to the left, it renders properly

Note: This also happens if the controller has a skin on it

I copied some lines from the 1.15 version which might fix it. I can't replicate it in my workspace so I think it's another block that gets rendered before the elevator controller that changes a default value.
I uploaded an alpha 1.2.4a version for 1.12, could you see if that fixes it?

Yes. I will test it right away ^^

Still the same

Thanks for the quick response.
Since I can see the display renders just fine, I changed the buttons to render the same way. Could you test 1.2.4b?

My pleasure. I love this mod ^^
Let me see

That was a perfect fix, @SuperMartijn642 .
1.2.4b rendering is perfect.

Thank you ^^

Nice, I will push it to version 1.2.5.

Thanks for the report

No problem. And thank you.