Nighthawk M1 (MR1100-100EUS) DNS domain suffix set to 'net'

I recently bought a Nighthawk M1, and am generally happy with it. The performance is much better than with my old mobile router. However, it uses 'net' as the domain suffix for devices on my local network, which is highly problematic, and I can't see a way to change it.

The router itself uses the DNS name 'm1login.net', which is okay, since that is registered to Netgear Inc., so presumably doesn't interfere with anything else. However, a local machine called, say, 'internic' would override 'internic.net', making the latter inaccessible if the local machine is registered with the router's DNS server. If the machine is not registered, then an attempt to resolve the IP address of the local machine called 'internic' would instead return the IP address associated with the external 'internic.net' (registered to ICANN).

The 'internic.net' example is relatively harmless, but other .net domains might be owned by malicious entities, and accidentally accessing one of them instead of a local machine could cause problems.

Is there any way to change the DNS domain suffix used by the M1?