We are sorry for the inconvenience and thanks for reporting. In general please always provide a problematic asset that leads to the problem up front, otherwise days will pass unnecessarily until we can reproduce the issue. (In this case it was most likely locale-related, as it could not be reproduced with the asset provided on the github issue ticket, but this is a rare exception).
We have just pushed a fix for this issue, new 3.8 and 4.0-beta spine-unity unitypackages are available for download.
