Was not a bug.
Just did my own macro that does this and it worked correctly…used fel domination and then summoned the demon i selected in the same click…not sure why mine works and yours does not but it is working…
Check your syntax and make sure your macro actually is as you have it posted here because it works as you say it did previously.
Also disable any addons you have, maybe that is causing a problem?
If an addon is the issue, enable them 1 by 1 until you find the problem child.