The InternalLevel Part of ItemLink of Food is not Calculated in Guild Banks

[Baertram]

But guild banks shuld be different compared to vendors, as the items are either already bought or at least were in your inventory already before you depositted them to the guild bank.
I do not see why there should be any difference to normal banks or house banks.

Unless guild banks need to strip the level to make the link kind of non-unique to "better stack items", but those should all have level = 50 I think (so stack either way if the itemId is the same).