Sorry you are having trouble. As you found, the way scaling and flipping works changed in v3, described here:
抱歉，您遇到了麻烦。 如您所见，缩放和翻转的工作方式在v3中发生了变化，如下所述：
Blog: Spine 3.0.00 released
This isn't something Spine can fix automatically because the way scaling and flipping used to work is not the same as scaling a bone using -1. Unfortunately the only way to fix it is to rework the animations manually. 🙁
这不是Spine可以自动修复的，因为缩放和翻转的工作方式与使用-1缩放骨骼不同。 不幸的是，修复它的唯一方法是手动重新制作动画。 🙁
Note this is the only time we have ever made such a large breaking change. I know it is very inconvenient for old projects, but we felt it had to be done because the new way is so much better.
请注意，这是我们唯一一次进行如此重大的更改。 我知道这对旧项目很不方便，但我们认为必须这样做，因为新方法要好得多。
