@Wayne-TP Thanks for your response! On reflection, I believe the RV20 simply behaved like every other robot vacuum would have - it lost its bearings, ditched the map and went on a search for the...

Greetings! Admittedly I did not have high hopes for the vacuum robot at 130 EUR, but ignoring invisible walls (I assume the robot might also ignore no-go zones but I'll give that a try), regardless...