Player reach is longer client-side

Previously, players could interact with blocks at up to 5 blocks from their position, and interact mobs up to 3 blocks away in survival or 5 blocks away in creative. In 1.20.80 these distances are about 5.3 and 3.3 blocks. It appears that the measurement is being taken from the edge of the player's collision box instead of the center. The extended reach occurs on the client thread but not the server thread, which causes glitchy behaviors like inventories closing as soon as the player opens them from the extended distance.

Steps to reproduce

1. Make a row of 6 blocks at head height.
2. Stand against the block at one end of your row and face into the row.
3. Stand still and mine.

Expected result

You mine 5 blocks.

Observed result

You mine all 6 blocks.