When I mine a block or ore, or even when I’m farming, items will disappear before I can collect them. I haven’t noticed any sort of pattern with it, but it happened in 1.21.7 as well. I’ve lost wheat, diamonds, iron, coal, stone, dirt, and many other blocks and items, because they despawn/disappear within a second or two of touching the block below where they were mined from. It doesn’t happen every time an item is mined, and it seems to be at random. There’s no correspondence with the speed or frame rate of my computer, everything on my end is set up in a way that should be causing no issues.
it happens in non-modded worlds as well, i just was playing in my modded ish world (shaders, texture changes, and appleskin + day counter are the only things changed that arent just aesthetics) - i mined 12 deepslate blocks in the video, had 57 in my inventory already, and when i went to check, i had one stack (64) plus 4. 57+12 is 69, which means i should have had 5 in the second stack, not 4. it’s a minor error with this specific example, but it’s frustrating when it happens to diamonds or iron. i also only recorded it because it started to happen again, with the diorite and deepslate both disappearing instantly.