I know what you mean, but it would depends on my current situation. Assuming I’ve had to find another job in short notice (and I’m still in my probation period) it could be a great opportunity to leverage a massive pay increase, then spend the next year planning a proper move.

I wouldn’t list it as separate employment on my CV, unless I knew it was going to be scrutinised, in which case, it’s easily explained and reflects pretty well - they wanted me back.