If I may provide something tangible, though I don't think my situation is a bug:
Lastfell in Thalmarkin has been running a 17% tax for some time now; I seem to remember getting complaints from the peasants when I started... but I needed to boost gold production now, so I checked back a few region reports and didn't see the complaints. I just changed it to a 20% tax rate yesterday or the day before, so I'll let you know if I see a complaint message or not.
I typically run my regions light to avoid more region maintenance, so I may not actually be pushing Lastfell, hence why I don't think it's a bug yet.
