Persistent error message "This generator is not available in versions above 1.18.2"

[Jack-McKalling]

Once you select a generator that is unavailable, every generator you switch to then after, will have the same error message even if it didn't before.

How to produce:

• Go to main page https://misode.github.io/
• Click "all generators", and for instance "configured feature" (notice no error)
• Now click the down-arrow next to the page title and select "structure feature" to land on https://misode.github.io/worldgen/feature/ (notice the error pops up)
• Now click the down-arrow again and select "configured feature" again (notice the error stays)

[misode]

This is not trivial to fix and will probably require a bit of a cleanup/refactor. When attempting to fix this I always ran into an infinite re-render loop

[misode]

This has now been fixed, along with that an improved error panel