I have received your email but I have not been able to reproduce it in my test project with the code - either I accidentally fixed it since last release or this is a GameMaker bug that only exists in some runtimes.
No estimate for when the new version will be ready - there are some technical challenges (including coroutines, which work awfully weird in general) and also GM updates keep breaking my code - if you download the repository and compile it, the unit tests fail in good half of recent GM updates.