I create simple spine model in DragonBones, export as spine3.3 and added to empty test project. Build by Ctrl+B is good (windows platform) - model displayed correctly, all textures present, animation played, ik_constant working.
Sorry for the delay, took a quick look at this today. Think I found the issue, but I won’t have time to create a fix for todays beta. However, might have a workaround for you in the mean time.
In the exported JSON spine file, change any occurrence of “mesh” into “weightedmesh”. Then it seemed to behave correctly in both editors (and should work when bundled as well).
I’ll try to make a proper fix for this ASAP, but for now try the workaround and let me know if it works for you!