SceneLoader.Append breaks the Loading Screen in 5.0

[a_bolog]

Run this in both v4 and v5.
https://playground.babylonjs.com/#2NQFG0#6

v4 - works as expected
v5 - does not display the Loading UI

If BABYLON.SceneLoader.Append is placed after creating something in the scene, it works as expected.

What is going on?

[sebavan]

@carolhmj could you check this one ? if not I ll try to dig in

[carolhmj]

PR up to fix this, thanks for the report! Wait to add pending data to the scene before loading screen logic by carolhmj · Pull Request #12785 · BabylonJS/Babylon.js (github.com)