[Breaking] Trading is completely broken in 1.16 on iOS/mobile

Partner Rank: Critical - 1

Verification Builds: Retail 1.16.0

Regression Builds: N/A

Summary: Trading does not work on 1.16 on mobile

Affects currently Live Content: Yes

Impact: Trading does not work

Repro Steps: Open up a trade on iOS. Placing an item in the "offer" slot causes the UI to update, but then the items are returned to the inventory before the player has chance to complete the trade.

Observed Results: The trade is effectively canceled before the player can trade.

Expected Results: The items should remain in the UI to allow a user to trade.

Screenshots/Videos attached: Yes
Video: https://www.youtube.com/watch?v=W_NvEkqm5BU
Timestamps:
0:00 Pizza Delivery Sim (trade 1)
0:21 Pizza Delivery Sim (trade 2)
0:26 Elf Town
0:34 Play: City Mall (Jigarbov Productions))

Notes: We have tested other non-57Digital content and this appears to be affecting other teams too.

Tested content:
https://www.minecraft.net/en-us/pdp?id=68e1dfca-fe2c-4db3-bb19-f0820bad9782
https://www.minecraft.net/en-us/pdp/?id=243a9c82-f3c3-4cb2-ba15-10db74b9ca24
https://www.minecraft.net/en-us/pdp/?id=78ff0345-fb18-461b-9395-ed07eecc136f
(but likely impacts a lot of other maps too?)