I do want my bits to transported reliably, but when I have internal services, I want my bits to stay realiably internal. Split DNS is the easiest way to achiev

I do want my bits to transported reliably, but when I have internal services, I want my bits to stay realiably internal. Split DNS is the easiest way to achieve this, but it breaks. DoH is not the problem. I'm using it too. It is the "surprise" that my devices are not using the one given to them.