I ~don't know if that may be your issue, but gonna take it as a chance to say that my router has a huge issue; it drains ~every device connected to it. It manages to drain ~15-20% of a ~7.000mah tablet battery in a night. Kinda the same with my phone. That's ~why I trun off wifi almost every time I close my phone (there are apps for this, previously there was a setting on older androids).
This ~doesn't explain battery drains on new roms (different battery cinsumption between roms), but it explains battery drain for ~very device connected to my router. (It's ~supposed to be a faster one, but lol, they should probably fix their stuff before they give them to their customers...)
So, if you happen to test for the first time the battery drain on a device on phone, you may want to check first if your router is ok.
You have a mi 11, so it's probably new. Have you tested battery drain beforehand or is this your first test?