There Seems to be issues with sync on End-to-End Encryption. Is it realy working?

I have a Nextcloud 20 up to date.
I wanted to look for this feature, but looking at the comments and eval that are bad, I was wondering if it was worth it installing it, as some comments say that it breaks synchronisations.

I have clients syncing from OSX, Windows, Linux.
I have plenty of users around.
So I don’t want them to be bothered if they don’t use the functionality.

Will loading the application break synchronisation of users not using this function ?
What is the GitHub issue following this issue ? (So I may look and may be help)