P: Smart Object marquee tool cut pixel bug

Hello, 
Long time user, 25 yrs profesional retoucher. Discovered a random little bug today I thought I'd pass on. Using PS 2023 24.1.1 on various Macs, all "up to date" etc.
The bug is this:
If you make a marquee selection over a Smart Object you can then "move" those pixels by selecting the move tool and then using the keyboard shortcut arrow keys on the keyboard. I also was able to "move" some pixels and then even transform them wtih "command T" 
All of this is on a smart object layer, not an open smart object. Basiclly "editing" a smart object that isn't open.
Not sure if I can post a video if my discription isn't clear enough, and happy to pass one on if needed.
Cheers