MM 5.4.0 28c6b0f1 || Paper 169 (1.20.1)

Blockcentered attribute causes the skill to cease function if inherited target is a location targeter.

Skill:

TestTPLoopBreak:
  Skills:
  - skill{s=TeleportToFloor} @selflocation{blockcentered=true}
TeleportToFloor:
  Skills:
  - teleport @FloorOfTargets #also tried to put it here instead

This will work however:

TestTPLoopBreak:
  Skills:
  - skill{s=TeleportToFloor} @self
TeleportToFloor:
  Skills:
  - teleport @FloorOfTargets{blockcentered=true}

Console (Debug 9):