You don't even need to wait for the screen to timeout. If you press the power button to lock the screen you can't get back in.
Thank you for your feedback.
If you haven’t already, Please update Samsung Members app to latest version from the Galaxy store and send us an error report immediately after experiencing the issue from the Samsung member’s app -> Beta Feedback -> Error Reports to help us debug the issue.
We apologize for the inconvenience and appreciate your contribution to the beta program.
One UI Beta Team