What to do if the message “Laser distance sensor error” appears on Dreame L20 Ultra?

Hello, the first few vacuuming and mopping cycles went perfectly. Recently, and with increasing frequency, I've been getting the error message mentioned above. Nothing is misaligned, nothing is jammed, and all sensors are spotlessly clean! I've already deleted the map and recreated it, but nothing helps. Towards the end of the tasks, it gets worse…