Molgrips…I’ve had the opposite. Tyre will keep deflating despite riding, until doing the Stans shakey thing. With tubeless ready tyres, you can normally see the sidewalls are sealing as you get pinpricks of sealant on the sidewalls. Do the shakey thing, then put wheel over a bucket so its on its side for a while, then shakey again, replace on bucket to do the opposite sidewall.
Klunk…how did you seal it? Either the sealant will seal the leak without leaking after getting it evenly distributed, or it will fail and you will seal the sealant bubbling?! If its leaking and no sealant is coming through, then the sealant hasn’t got to the right place.