On Plethora 1.19, getMetaOwner seems to freeze/hang whenever it is called on an NI during the player's death.
Plethora 1.12.2 would give a "The entity is no longer there" error.
Test program:

while true do
  print(os.epoch("utc"))
  print(peripheral.call("back", "getMetaOwner"))
  sleep(0.1)
end

1.19 behavior:

1.12.2 behavior (similar setup):