Gecko isn't automatically installed with Continuous build (wine-stable_8.0.2-x86_64.AppImage)

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'msi' installers in correct versions for both archs are present in the AppImage, but are not installed in the prefix. Mono is installed automatically as it should.

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I built upstream Wine-8.0.2 (64bit only) from source on Mageia 8 (where the AppImage was tested as well) and same result there. Mono gets detected and installed automatically, but not Gecko. I tried 2.47.3 (which should be used with 8.0.2 according to the table) and also 2.47.4, same result - it doesn't get installed. So it looks like upstream bug probably.

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It gets more interesting. ;)
When built from source as described, it indeed doesn't install Gecko in the prefix. But when the HTML rendering is needed for the first time in iexplore, it will silently install it and use it. Gecko will then be present in the prefix and in the uninstaller.
I tried it also offline to eliminate the possibility that Wine gets Gecko from there.

But this isn't the case with the AppImage, where iexplore will not work and Wine will give the typical notification about Gecko missing.