Host name of client xxx => contains (at least) one invalid character at position 0

I am now seeing this error:

Host name of client 192.168.10.46 => "����U" contains (at least) one invalid character (hex a0) at position 0

It was logged at 2025-07-20 00:00:00

@DL6ER Do I need to enable more logging to run this issue down?