Still in Merchant Mode after subscription has expired.

I like to check the inventory of my merchant mode character on an alt from time to time to make sure it's still stocked up. I did the same just now and decided to hop on that account as my stock was low: I was in Bonta at the time.
When I logged in, I was immediately teleported to the Temple of the Twelve in Astrub. It turns out my subscription expired 5 hours ago.

I'm not sure if a character will be booted out of merchant mode after a set amount of time being f2p - but merchant mode is a subscription only feature, so I found it unusual that my character would still be vending when not subscribed. Just to clarify: I was p2p when I went into merchant mode.

Anyway I'm reporting this just in case it is a bug and people are exploiting it.