somtimes PNG EXPORT are make automatically 1x1 size.
I attached the Spine file below,
and deleted as much as possible.
These included two animation.
'bug' is final work,
'not bug' is past of final work.
Not only this file make bug.
my works are sometiome have this trouble.
i want to why :think:
spine ver = 4.1.19
my export setting =
Thank you for the detailed report! I have been examining this for some time based on the reproduction project you have prepared, and it appears that the problem lies in the simultaneous use of negative scale and IK constraints. However, changing the FPS on the export settings or keys' timing may solve the problem, so the detailed conditions are not yet identified. I have created an issue ticket for this bug:
https://github.com/EsotericSoftware/spine-editor/issues/730
We are sorry for the inconvenience, but please wait a little longer until we fix the problem.
thank you! 
