Kinda annoying but it tracks. If the merchant descriptor is basically a gift card reseller, some issuers treat it like cash equivalent and auto slap the fee plus interest.
I’d screenshot the product page showing it’s a normal retail gift card purchase, then ask them to reclassify it, and in the future use a card that you know won’t code it as cash advance, or just buy the physical card at Coles Woolies.
I used NOSH once after getting stuck with a card I couldn’t use, but I wouldn’t touch PayPal giftcard portals again if your bank is flagging it.