According to the page for the Spine runtime for ThreeJS, blend modes and two color tints are not supported:
https://github.com/EsotericSoftware/spine-runtimes/tree/3.7/spine-ts
Can blend mode support be added at some point? Is there a reason it isn't supported in ThreeJS but is supported in the WebGL version? Can the way it's supported in the WebGL version be migrated to the ThreeJS runtime or will it need a different implementation?