Buying a Big Poe Bottle from Kakariko Village's Bazaar as adult made me equip Mirror Shield, even though I never obtained it.
When purchasing, it first shows a popup text (with a blue background) about the big poe, and then the next popup says "Would you like to buy something else?" but it acts as an equipment popup for mirror shield. If you press A, it equips mirror shield, and then shows the actual "Would you like to buy something else?" popup that acts properly. If you choose "No", it does not equip Mirror Shield, and proceeds to show the actual popup for buying something else.

It is important to note that I have the "Ask to Equip New Items" option enabled. Which is what I believe gets wrongfully activated when buying the bottle.

This behaviour was reproduced by others using the seed file. As far as I tested, it only occured when buying a Big Poe Bottle, not when filling another bottle with bugs at the same shop for exemple.

Steps to reproduce :

• Buy a Big Poe Bottle at a shop (Kak's bazaar in the given seed)
• Skip the first popup about catching the Big Poe.
• Press A when asked if you would like to buy something else
• The Mirror shield is now equiped, and the slot is selected in the equipment menu, even if it is a blank slot (from never getting the item)

Version : Khan Alfa 6.1.0
Seed json file attached in the zip file.
Video of the bug happening also attached. I have inifinite money on, but it doesn't change the behaviour to disable it. My inputs are seen on screen, and you can see there is one A button press that equips the shield instead of going back to the shop.
Before the clip I did nothing special just traveling from my spawn point (Zora Shop) to the bazaar. I can provide a full video of everything I did to reproduce if that is necessary
I can also provide any other information that may be useful for investigating.
Clip+Json.zip