Thanks for reporting back!
The current LE10 nightly should be safe to use, we've been rather conservative and careful when updating the LE10 branch. But OFC we can't be 100% sure that something slipped through or will slip through in the future so always do it at your own risk.
I'm not sure if (auto-)updating LE10 nightly works as we've recently restructured the directory layout on the test server.
If in doubt just stick to the current nightly build, manually update it if you want or just update to the next official release when it's out (should be soon-ish, we're just waiting for Kodi 19.5 release).
so long,
Hias