Hello,
I'm wearing my watch while sleeping.
This morning, I checked my RHR just after waking up: 49, then I took my breakfast and started to work from home. After 2 hours, I checked my garmin app and saw that the RHR was 51. This is the third time it happens in the last 2 weeks, and it's not systematic.
This is something new with recent firmwares (it was not doing that before). Current firmware: 19.18
TLDR; RHR goes from 49 to 51 within the same day (I thought it could only decrease)