Can't load worlds

I cannot load my 45mb world in 1.16.0.64 as it looks like the loading is endless. I have some addons installed on this world (about 4/7) and this never happened before. It might have to do with the addons being outdated to the version but I think that this only happens when a huge update (ex;1.17) arrives. again, this never happened until now and the addons were all optimised to work with 1.16+.

If anyone knows why it does that, please let me know.

Also, all of the addons were compatible with each other.