I have upgraded to 3.7 just today, and it's great, the new features are awesome!! 😃
However, one of the things that are important for me to do are when I import data from a JSON that has been exported from Spine itself.
It presents this error:

Importing JSON from Photoshop doesn't get errors, just JSONs made from Spine. Here are my export settings:



I do this to make smaller Spine animations for the convenience of our team's developers with HTML5. I animate with big images then convert them to smaller sizes when animations are done. Helps save space overall since we have a lot of animations to do.
I do the resizing by Exporting the project with smaller Texture Output scale like 0.5 then import the resulting JSON into Spine again, with the Scale of the Import Data to 0.5 for Skeleton size. And then unpack the exported .atlas file and fix directories then finally export the whole project with the right size.
Saying this just in case there's another work-around to what I'm doing. I really need the Import Date of a Spine JSON to work. 🙁