[4.11P2 Prebuilt][Bug] HTML5 map downloading on the fly is broken. (Plus problems with non-map downloading on the fly on latest firefox)

Development Platform & Builds
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I tested this on my end, however it seems to package as expected for HTML5 and if I open the launcher helper and go to the local host all seems to work as I would expect. Do you have any other steps I can take to reproduce this on my end?