Player launch via Sticky Piston + Slime Block fails when sneaking on dedicated server

Both the server and client are vanilla 26.3.

Structure:

[Player]
[Slime Block] [Button facing down]
[Sticky Piston facing up] [Stone]

If the player crouches and then stands up, then presses the button, there is a chance that the slime block will fail to launch the player to the correct height (As shown starting at 8s in the video).

This issue only occurs on a dedicated server (even when hosted locally at 127.0.0.1). LAN multiplayer has not been tested yet, and it has not occurred in singleplayer so far.

No consistent way to reproduce it has been found yet.

No data packs or mods.