Yeah, I'm sure it'll be a pretty trivial thing to solve. I was just surprised that it failed such a simple task.
It's quite good for written stuff though. For anyone looking to use it for editing writing, I've found the
editGPT browser extension to be invaluable. Basically you can toggle it to show the changes in strike through text, so you can clearly see what changed and then decide what changes you want to integrate into the final text.