Thank you Misaki for the detailed description of your upgrading process, I appreciate it.
Nate, thank you for your fast return. I checked but still was not able to find a version 4.1.18 yet, when launching the Spine editor.
The bug is not fixed in the latest beta version either.
I might just add another problem related to this, that I recently noticed. This might be a related bug, or maybe I am only unaware and missing something:
When exporting an image attachment animation that was animated the traditional way, (meaning one separate attachment inside the image slot for each frame, and every single frame keyframed with the appropriate frame's visibility toggled), I can import the created json file as a new skeleton correctly, and all keyframes get imported. However if I import it into an existing skeleton, again, the keyframes do not get imported.
Some screenshots:
The image sequence created in the traditional manner (it has been saved as a json file):
When importing the json file as a new skeleton, everything works perfectly:
The keyframes were imported that way:
However when importing the exact same json file into an existing skeleton, the image attachments get imported but the keyframes do not get imported (and that happens with either option selected 'Replace', or 'Ignore'):
The keyframes have not been imported:
