Clean up some regen code

[SirYwell]

Overview

Description

This cleans up some

• constant conditions
• unused method parameters
• use of Long where long can be used
• typos
• duplicated code

Submitter Checklist

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1. Make sure you are opening from a topic branch (/feature/fix/docs/ branch (right side)) and not your main branch.
2. Ensure that the pull request title represents the desired changelog entry.
3. New public fields and methods are annotated with @since TODO.
4. I read and followed the contribution guidelines.

[NanashiTheNameless]

this causes issues on 1.19.4 for me

[PierreSchwang]

this causes issues on 1.19.4 for me

Regeneration logic is currently completely rewritten. That issue would be solved then as well. If you want you can create an issue (if none matching exists yet) which can be closed by that change then. Therefor you will be actively notified when the error is fixed.

[SirYwell]

I'm not sure how this would cause the issue, but if it worked before that, that's even more worrying. As it's a simple fix, I opened #2469.

[NanashiTheNameless]

I ended up cloning the latest version and reverted only the change to the Regen system manually and it worked again