The bug
The server console or LAN game output spammed with "PLAYER moved too quickly!" after a player dies and respawns.
Server console
[22:14:14 INFO]: [Les3awe: Killed Les3awe]
[22:14:15 WARN]: Les3awe moved too quickly! -11.28453520303416,-2.116501367928123,-62.12911357204942
[22:16:31 INFO]: Les3awe was killed
[22:16:31 INFO]: [Les3awe: Killed Les3awe]
[22:16:39 WARN]: Les3awe moved too quickly! -46.13969726382189,-14.112930305474706,-93.73915427829289
[22:16:46 INFO]: Les3awe was killed
[22:16:46 INFO]: [Les3awe: Killed Les3awe]
[22:16:47 WARN]: Les3awe moved too quickly! -35.19694635972356,-3.243413216081791,-13.679489466242739
[22:16:47 WARN]: Les3awe moved too quickly! -35.19694635972356,-3.243413216081791,-13.679489466242739
[22:16:51 INFO]: Les3awe was killed
[22:16:51 INFO]: [Les3awe: Killed Les3awe]
[22:16:52 WARN]: Les3awe moved too quickly! 5.169859688363443,-2.8685985614118863,-33.594936090566605
[22:16:52 WARN]: Les3awe moved too quickly! 5.169859688363443,-2.8685985614118863,-33.594936090566605
[22:16:52 WARN]: Les3awe moved too quickly! 5.169859688363443,-2.8685985614118863,-33.594936090566605
[22:16:52 WARN]: Les3awe moved too quickly! 5.169859688363443,-2.8685985614118863,-33.594936090566605
[22:16:52 WARN]: Les3awe moved too quickly! 5.169859688363443,-2.8685985614118863,-33.594936090566605
[22:16:52 WARN]: Les3awe moved too quickly! 5.169859688363443,-2.8685985614118863,-33.594936090566605
[22:16:52 WARN]: Les3awe moved too quickly! 5.169859688363443,-2.8685985614118863,-33.594936090566605
Steps to reproduce
Join the official vanilla dedicated server.
Move 3 chunks away from the respawn point. No need to use the teleport command.
Use the following command:
/kill @p
Click the "Respawn" button.
Noticed some spam on the server console or LAN game output.
Could you give us the computer specs? And test whether the issue happens with just the teleport command?