There are portions of my inventory that I can't access. Mousing over them doesn't reveal the block name as a tooltip, and I can't click on any items to pick them up or move them around. Right clicking also doesn't work. If I open a chest or other inventory, I can access the slots as normal. These slots are always on the right side of my inventory; sometimes just the top row, sometimes all three rows. It never extends to my hotbar.

The whole bug is very inconsistent. Sometimes it doesn't happen at all, sometimes it's only a few slots, other times it's half my inventory. Logging out and back in doesn't change it, either.

My current fix is to carry around a shulker box and open it any time I need to access those slots in my inventory. It's pretty annoying, though.

My husband doesn't seem to ever have the issue, so I'm not sure how to reproduce it.

All windows are either closed or minimized before I play, so I don't think it's an issue with my mouse interacting with other windows.

I experienced this bug in 1.14.1, as well. I didn't play 1.14.0.