I don't know if that's already known, I saw that too yesterday. I'll make a bug report if it doesn't work in newest version v5.34.10 (unless you did ?).
Edit : it is still broken in latest version.
MacroDroid support said:The value is actually restored correctly and it's only in the selector that the issue exists in showing the current value.
I will fix of course but it's not as urgent as I had feared.