As reported in my user talk page, it seems Android app does not show map with an overlay. I don't know what URL it is using, or if its stripping all the url query params. Both of the links the user provided did not work for me in Android beta.
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I dont think this issue is valid anymore.
For example here is an article with an overlay:
https://ca.wikipedia.org/wiki/Casa_Mil%C3%A0
The mobile-html output renders the map with the overlay:
https://ca.wikipedia.org/api/rest_v1/page/mobile-html/Casa_Mil%C3%A0
Also a screenshot from android studio locally:
Closing this one for now as invalid. Feel free to reopen if we have more information about reproducing the issue.