I really hope this is a bug and not as intended but mounted combat has been nerfed again.
On testlive if you get hit, no matter what the saddle (even with a heavy saddle) you are instantly knocked. Even with FULL STAM on the horse. Even worst now when dismounted you’re stammed out (like currently) but your stam DOES NOT REGEN UNTIL YOU TAKE A HIT. Riding a horse into combat is now a death sentence.
Please tell me this was an oversight. And will be fixed.