Follow to https://confluence.atlassian.com/bitbucketserver/how-to-update-your-add-on-779302412.html, we need to migrate stash.page.pullRequest.create to bitbucket.page.pullRequest.create. But it look like Atlassian removed ability to extend Create pull request page from plugins.
Community moderators have prevented the ability to post new answers.
Seems
bitbucket.page.compare
should replace old stash.page.pullRequest.create.
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