Broken mod

Can not reproduce
Issue description

When I updated from 1.12.2 to 1.15.2 So much elements was glitched. I can't fix them because I don't know what's the problem. Please help me I don't want to program another mod! (Sorry for my English)

Issue comments

When possible, attach your MCreator workspace (or even better a minimal example workspace required to reproduce the bug), game logs (full logs, do not crop them, in text format, not screenshots of logs) from the Console tab or terminal and steps to reproduce the bug in your workspace. If logs are long, use service such as Pastebin to host the log and provide the link to the log from the ticket. Please specify which mod elements to check in your workspace too, if applicable.

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