Phantoms overhead and attacking in daylight

Phantoms were present in daylight after being afk for a few day cycles.   Attacked after stepping outside.  Waiting for day again to see if still present.  Will then exit game and re-enter.   Phantoms were there next day.   Exited game, gone on re-entry in daytime.   Will try to re-create to see if a real bug or just a glitch.