@Pkeod We’re faced with same issue today, as workaround we found solution in downgrading Spine version to 3.7.94
              
              
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          Oh how I long for the day when we have an extension with the official spine runtime available!
              
              
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          Sprite swapping still works with that version’s output? Good to know!
It is on our 2020 roadmap but if I were to guess I’d say more towards the end of 2020 if anything.
PS Anyone could actually start working on it and base it on the official C runtime: spine-c Runtime Documentation
              
              
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          Try loading the animations in Spine 3.7.94 and seeing if the export works then? Doing a diff on the data might reveal something simple that could be data processed quickly for all existing animation data.
              
              
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