Is that second template a new/empty one, or do you reference the old one, or do you try to create it from a file template?
I'm on the same version and did quite a bit of corridor modelling before Christmas.
I haven't seen it fail with an empty new one.
I did have massive issues though with conditional statements crashing the "Transaction manager" all the time, having to restart TBC very often. But I couldn't pinpoint what exactly was causing it and our dealer hadn't heard about that symptom either.
Copy and pasting instructions, especially from other templates basically didn't work at all. Not crashing though, just refusing to paste, since the referring node didn't exist. I never use "previous node" in my instructions, I always prefer to point the instructions to one specific node. So, instead of leaving the fields blank it plainly refuses to paste the instructions.
Creating a template from an XML file did basically not work either. Most likely the same issue with instructions pointing to nodes that don't exist yet.