I'm tested MTS with Countinuity mod on 1.20.1 and recently got the "Resource reloading failed" after boot (and crash ofc).
Countinuity is used via Sinytra Connector on Forge 47.4.0 and its needed for ctm functions in Yuushya Townscape mod for my modpack.

A link for stacktrace what happened: https://gnomebot.dev/paste/mclogs/2kfuJCf

Don't post bugs for beta versions on the GitHub. Post them in Discord where you got the beta from.