[BLOCKING LIVE CONTENT] world crashes after startup

Verification builds
1.7.0.2_beta-21

Summary
opening "Art lab" live content from the marketplace pops an assert error and crashes the game.

Impact

"Art lab"  worlds currently live on the marketplace.

Repro Steps:

1. download the "Art lab" from the marketplace
2. create a new instance from the world templates
3. enter the worlds

Observed Results:

an assertion error pops up on "Art lab" : errors.txt

Expected Results:

world start without errors and allows the player to keep playing normally