In `SyncModule::sync_curves/sync_point_cloud` the material variable
can be used after it has been freed. The cause is that cryptomatte
can request a new material, which might trigger a relocation of the
references material.
This PR fixes this by doing the shadow sync before the cryptomatte
sync.
Pull Request: https://projects.blender.org/blender/blender/pulls/121909
6fbd287493