The new LR 1.2 works great with my P30+ files, tethered or not.
- uncheck the Show import dialog when a memory card is detected
- insert your media card & FROM the file menu > Import Photos from Disk
If you use the auto import feature it will not work, you must go through
the File MENU or copy your files to your HD & then drag to LR
Works great & the speed is fast especially when previewing files to rate.