<caster.owner.name> placeholder returning the wrong name.

On MM build 5.3.5 Premium 64893d49 | Paper - 307

This script:

- setowner @trigger
- delay 1
- command{c="say My owner is <caster.owner.name>!"}

Will return the name of the mob casting it when executed ~onInteract. It should return the name of the owner, which would be the interacting player. Instead this is the result: