Disappearing Instruments?

When rendering-in-place, I’ll often go back to the original track with a VSTi, sometime later, only to find the instrument mysteriously unassigned and I have to start from scratch.

I’m not disabling these tracks, as there is a known crash bug when freezing with disabled tracks that I’d like to stay far away from. I’m just manually powering down the VSTi and all inserts.

It doesn’t seem to happen with any specific VSTi, but they are all 3rd party.

Anyone else seeing this?