cheamue Thank you for explaining the situation. However, we would like to emphasize that we do not recommend making it a regular practice to create skeleton data in a newer editor version and then downgrade it for use, regardless of whether physics constraints are involved. Some users mistakenly assume that the “Version” setting in the JSON export configuration allows exporting from newer to older versions, but this is not the case. The version option is provided solely for exceptional situations, such as when a project was accidentally saved in a newer version.
Downgrading can result in the loss of various data, not only physics constraints—for example, even bone rotations may reverse direction. Therefore, we strongly advise against it.
To take advantage of the new editor features, please upgrade your entire project. We make every effort to minimize runtime changes so that upgrading is as smooth as possible, and we are always available to assist you should any issues arise during the process.
