Game crashes and RTX does not work.

The game crashes 50% of the time on startup and when trying to load ANY texture pack. Also, RTX does not work since the 1.19 update. Receiving error message "Resource pack fallback. Low memory. Textures will have reduced level of detail" I'm running a brand new pc. ROG Strix with 3080 ti. I have plenty of memory. NON-RTX packs work fine. None of the RTX packs I've found will work properly. Hope you can fix this soon. Thanks.