Brave won't launch : permissions problem on Big Sur?

Since installing MacOS11 (Big Sur), Brave has refused to launch every day at first attempt, with a message that I do not have permissions to open Brave.app : the second attempt always works with no problem.

MacOS:

System Version: macOS 11.0.1 (20B29)
Kernel Version: Darwin 20.1.0

Brave:

Version 1.17.75 Chromium: 87.0.4280.88 (Official Build) (x86_64)

Additional Information:

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