Bugged how? Haven't played 20.x long enough to notice anything weird, unless you mean even with shield you can't take all actions like you used to.
I had just assumed once you have the shield, Consent can't go down and she'll let you do anything up to her limits/preferences (i.e a model that's not interested in services will still not let you engage sexually).
Aaah, I wasn't specific enough. That above meant for the girls who come already with the shield from start, or they get it from interview 1st question > what is your preferences. eg. wannabe porn actress., mostly.
Now, best explanation is this example:
Before any talk/action, look at: monkey > female > difficulty > breast/buttocks/mouth/crotch - variables (sliders but only representative) , from very low to very high. - you can also re-read values from girl, eg. after personality import, with "evaluate" button.
... I got one girl who had difficulty - very low for buttocks/crotch from the very begging, before "hello".
After I asked her for her modeling preferences .. she said porn actress , got the shield even consent was like 10-15% , and the "possible" favor scale jumped to the roof >100%.
But! , difficulty for body parts also changed to - very high , just because of "shield" - and she was practically unusable for any interaction afterwards. (I even raised her consent to 50,100% , she was still unwilling to do anything)
It's hard to say what is broken , since too many variables/effects , but instant "gratification" (shield) seems broken.
For other girls, who can reach "shield" seems ok , depends on the girl how quickly shield can be reach.