I've set up the warmup config like that :

warmup:

globally enable or disable warmups.

enabled: true

set to true if movement should cancel a warmup

onMoveCancel: true

set to true if receiving damage should cancel a warmup

onDamageCancel: true

individual command warmup timers

home: 3
spawn: 3
groupspawn: 3

When I just get hit by a player, I type /spawn
I get the message telling me to wait 3 seconds.
3 sec later I get the message telling me I'm being teleported to the spawn.
However nothing happens and no error in the console.

It appears to be unrelated to HomeSpawnPlus. Is is caused by another plugin called PvPManager.
The issue is closed.