UI frozen when swapping scenes

I have notices a new bug in BJS 6 in my app when swapping scenes and I can see it also exhibited in this playground. The camera stops taking mouse input and the screen freezes.

Mixed content error: http image loading https PG is causing the error.
http:~.jpg → https:~.jpg

As long as the mixed content issue is fixed, both versions behave the same 4.2 and 6.0 : https://playground.babylonjs.com/#MXCRPS#501