loot table chests in marketplace content using randomised loot are now empty

Partner Rank: 2
 
Verification builds:
Beta 1.16.0.63 & 1.16.0.64
Summary:
Chests pointing to loot tables that already exist in the world no longer generate loot when opened.

Impact:
This results in key components of maps using randomised loot such as the popular MEGA skyblock being disabled. Progression is halted and the player no longer is able to get loot. Also prevents an upcoming map from releasing. This also impacts Infinity Skyblock
 

Repro Steps:

1. create the world mega skyblock from the marketplace
2. open the chest at -64 62 328
3. close the world
4. open the world and open that chest again
5. close the entire game
6. open the game and open that chest again

 
Observed Results:

note that the chest is empty on step 2 and 4 but on 6 is randomly fills itself

Expected Results:

the loot should be in the chests from the beginning and not require a game restart
Screenshots/Videos attached: 

So i tried to repro this whole process for a video and the chests sometimes have stuff in it and sometimes dont. seems like it is inconsistent and based on how many times the world template has been created??? i dont get it.

Regression Build:
Yes, this behavior is not present on Beta 1.16.0.61

Notes: Confirmed on 2 windows10 devices