Hi, I wanted to sense check this first before I submit a bug and I haven't found anything about this particular issue.

When I'm saving Apex rigs as .bgeo.sc files, I'm getting instant crashes when animating with blendshapes added by the autorig component, however if the same rig is saved as .bgeo, I don't get the instant crash.

With 20.5 is this known issue or should I report this as a bug?

I haven't seen anything like that, please submit a bug with your sample scene along with steps to reproduce using it. Thanks!