HTML Packaging (dev-mobile branch) Black screen if multi-threaded, plus mouse is not captured, but audio plays

Development Platform & Builds
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this was fixed in our 4.22 branch.

https://github.com/EpicGames/UnrealEngine/commits/4.22?after=ad434405c909d2e7458052b6826902488e2beda7+139

in particular, on feb 13th – dd82cde, c395070, ae679ea and 0668a5b

these changes will get pulled back into dev-mobile eventually. 4.22 will be “more stable” while dev-mobile is “more bleeding edge”.

i would highly recommend NOT using anything outside of the tagged “4.x-release” for production.