So since installing beta my Secure Folder (SF) app will no longer open beyond entering my PIN. I have discovered that I can still add items to the SF. I've found a workaround until Samsung squashes this bug.
Go into device Settings,
Click Samsung App Settings,
Scroll down & click SF,
Enter your PIN which will bring you to SF Settings,
Under General tab click Apps,
From here you can click Gallery or My Files,
Then click Open at the bottom left.
You'll say least have access to your SF this way for now
That's strange I guess it's a hit and miss bug. I always open my secure folder by typing it in on app search then enter my pin, that's how I get in mine. Guess I'm lucky it doesn't crash