Before 22w19a the behavior of hovering over an item in the toolbar was smooth and did not have any issues. This issue makes it a bit rough when reading lores as the text randomly will jump for certain items depending on where you are in the inventory. It should be noted that I had to be in full screen to reproduce this issue.

22w18a:

22w19a

After this version, a change was made in the Screen#renderTooltipInternal class which included this new part of code (yarn parameter mappings).

if (y - j - 8 < 0) {
    m = y + 8;
}

This seems to cause this issue.