At the time some other systems kinda had this system (sometimes not so great), but Juniper had perfected it.

These vehicles really should have a similar dual partition setup where you can on your own go into the menu and say "Yo, things broke, go back." and you're good to go.

Based on the last paragraph it sounds like Jeep ... might have such a system, but it isn't clear.

I assume other modern hybrids have control processors that perform similar functions. Have there been similar incidents/updates/flaws causing in-motion resets?

Completely wild speculation, but my initial guess is a memory safety issue that could have been caught with better languages or fuzzing. Neither are as common as they should be in automotive.