+- "?" A GitHub PR has been opened, which suggests there might be a refcounting issue in the Python binding. https://github.com/apache/qpid-proton/pull/360. Looking at the history of the relevant code, it looks to me that the PR is trying to fix reference counting in code last updated in PROTON-2430, which was already released as Proton 0.36.0. Therefore, whatever issue the contributor is trying to solve, this is not a release-to-release regression.
If they are using only released pypi packages, then I think this is the earliest they got the code to their hands and can report an issue, though. -- Mit freundlichen Grüßen / Kind regards Jiri Daněk