Luda

Definitively not a Minecraft issue. This is my configuration:

SVR  _minecraft._tcp.mc.[domain]    0 0 25585     cloud.[domain]
A      cloud.[domain]    [server_ip]

Make sure that you have set:

query.port=[server port goes here]

Maybe that's the problem you're having. Both query.port and server-port should be set to the same value.

I don't understand the problem here. SRV records do work for subdomains. I have used them myself many times in different versions of Minecraft and server querying worked normally. It is also used by a existing public servers. Are you sure this is a Minecraft issue rather than a misconfiguration of some kind?

I will be trying to make a test really quickly and I'll come back to you.