Issue Summary

When merging a pull request using the Squash merge strategy, in rare cases the Pull Request itself will be left in an Open state despite the merge actually having taken place.

Steps to Reproduce

1. Create a pull request
2. Merge it by selecting the "Squash" merge strategy

Expected Results

A squashed merge commit is created on the destination branch and the Pull Request is moved to the "Merged" status.

Actual Results

In rare instances, the squashed merge commit is created on the destination branch, but the pull request remains in the "Open" status.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available.