We have the same problem. The BitBucket support team was unable to solve and answered:
" Sandeep Khandelwal commented:
Thanks for reaching out to us with your issue.
Unfortunately, this add-on is not supported by us as per the add-on support information here.
We, Atlassian, do not have the ability to modify any aspect of a third party integration which we do not own. We provide the means to develop third party applications and add-ons through our API (https://developer.atlassian.com/bitbucket/api/2/reference/) but we do not own the outcomes of what comes out of it, the API is provided “AS IS”, per our terms of service.
I would suggest you reach out to SonarCloud community on this issue at:
Hope this helps and let me know if you have any additional questions.