Try the following:
UI->Settings->Voice Assistant-> and for your assistant that was used (ex. the default one named Home Assistant) you’ll see 3-dots. Click on the 3-dots and click on Debug. This stores traces of the voice pipeline, so find the trace your after (based on time), or simply start a new session with your VPE and then come back to this debug. At the bottom is “RAW”. Within this you’ll find the entity that was turned on/off (or maybe it failed in its attempt).