Mac client 3.3.1 can't authenticate after upgrade to 20.0.12

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Nextcloud version : 20.0.12.
Operating system and version : macOs 11.5.2
PHP version : 7.2.34

The issue you are facing: client 3.3.1 can’t authenticate via browser

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. open the client
  2. It asks for authentication and a browser window opens
  3. we authenticate (2FA), but the client window remains open waiting for the browser
  4. we have tried with different browsers
  5. we have re-installed the client but it does not work

Anyone with the same issue?