It is difficult to do anything with these reports. We have to try to recreate a project like what you have, export with 4.3, import with 4.2, then find the problem. When we try that and don't find a problem, we have to ask you for more information.
If you have a project that shows a problem, please just post the .spine
with instructions on how to see the problem.
4.3 (left) when exported to 4.2 (right) doesn't show Y mix being lost. 4.3.21-beta
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