Hello,

The following PR introduced a regression: https://github.com/jenkinsci/bitbucket-branch-source-plugin/pull/796

Fetch on pull requests has started to fail with the following error: 

ERROR: Couldn't find any revision to build. Verify the repository and branch configuration for this job.
ERROR: Maximum checkout retry attempts reached, aborting

This issue is reproducible on plugin versions from 871.v28d74e8b_4226 to the latest.

We had to roll back the plugin to 866.vdea_7dcd3008e.

It seems that in an attempt to fix the checkout flow for Bitbucket Data Center, Bitbucket Cloud was not properly tested, which has become a major issue for us running Bitbucket Data Center v8.19.5.

As a side note, the Atlassian issue referenced in the comments still hasn't been addressed, so it's unclear why this change was made in the first place.

Your attention to this matter would be greatly appreciated.

Thanks in advance.