Pull Requests - Race condition between "delete source branch after merging" and the "automatic cascading merge"

Automatic merging failed for unknown reason
{cause: null, commitId: refs/heads/release/release_1.1, keyedMessage:

{key: bitbucket.service.pullrequest.nosuchref, localisedMessage: Repository "merge-test" of project with key "PROJ" has no branch "refs/heads/release/release_1.1", rootMessage: Repository "merge-test" of project with key "PROJ" has no branch "refs/heads/release/release_1.1"}
, localizedMessage: Repository "merge-test" of project with key "PROJ" has no branch "refs/heads/release/release_1.1", message: Repository "merge-test" of project with key "PROJ" has no branch "refs/heads/release/release_1.1", messageKey: bitbucket.service.pullrequest.nosuchref, stackTrace: [

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