Several Minecraft servers are having problems.
For example my Minecraft server IP: ‘mc.stardix.com’ doesn’t work if you try to connect from version 1.8 to 1.11
But trying to connect using 1.12 and up will work.
Meanwhile players are having to connect via 1.8 using ‘play.stardix.com’ IP as ‘mc.stardix.com’ which has the same SRV and A rule does not work.
Since 07/07/21 several Minecraft servers have this problem.
I found a topic with something related to the problem: