There was a problem with inadvertent creation of non-matching folders when using the 'Copy empty subdirectories' option, which is fixed in the latest beta build.
As far as your includes/excludes, B*/* means match all files within subfolders starting with a B (non-recursively). \bet L1\exclude means exclude all files named exclude within the folder bet L1. And it does seem to do that.
Possibly, you want to match all files (recursively) within folders starting with B. Use B*/**/* for that. And to exclude all files within the subfolder bet L1\exclude (recursively), use bet L1\exclude\**\*. To exclude only files within the folder bet L1\exclude, use bet L1\exclude\*.
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