Problem with adding a rule to the firewall

Hi!

I tried to add a new firewall rule to allow LLDP Traffic, so I added a new ethernet rule und wanted to fill in the Protocol Type field with "0x88cc" for the ethertype of LLDP, but I can only type in "0x88c", because I couldn't write a second "c". I also can't type the example "0x86dd", even if I copy it, there is only "0x86d".

Why is it impossible to fill in this field correnctly?

Regards,

TWSS