Procedures gets corrupted

Hi there! I found a bug in MCreator 2020.4. So it started when I was making a procedure and it was BIG. But when I go to edit that procedure, nothing shows up, only the setting for the "if do" statement but If I click it, it shows an empty box and there's no way to close. I found no solution for this. Is this a bug or is there a solution for this?

- Regards best

Mayonnaise.