Of all the things in these Betas, Modes seems to be the most unstable thing as of yet, although it is improving rapidly.
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