from what I'd heard about the new version (haven't played it yet) it shouldn't function quite the same
However.
It deals with how the Shopping Basket is Identified.
When you put items into the shopping basket, and only the SB, it calculates price - it isn't even entirely accurate and the slightest error (item removed and put back in) can cause the whole order to be labeled "stolen" (non-preventing in .82 - but in the future, "Stolen" will prevent customers from buying it, if I recall correctly)
The main "stuck" problem is because the item's Physics are "Locked" to the "Shopping Basket" - which has a closed lid (if you closed it, if you didn't, this doesn't even arise as a problem.)
When you take the "Shopping Basket" out of the store, it calculates the "deduction" listed on it (may be negative, thus granting you money) and changes the "Shopping Basket" into a "Crate" - Not even the same "Crate" as the (Player) "Crate" - Notably the "prompt" for opening and closing text- doesn't show up.
Because it is now "Crate" when you go to "open" it, The items physics are not returned. - Because you opened "crate".... Not "Shopping Basket"...
Yep. 'something along that line' is why it does this.
(Note: Names of items above are.... Not... exact? They're just names I've 'nicknamed' them for identification purposes, so to say.)
The Easiest ways around it if you intend to continue using his store is to just not close the basket, Carefully, very carefully, carry it out with everything, Then Close it.... However I don't recall if that will "lock them" so be ready for a physics tornado to possible form inside of the crate, which may potentially still eject them through the crate. - As I said
It becomes a "Crate" but not necessarily a (Player) "Crate" like the ones you spawn with.