when using the Timeless skin in MediaWiki 1.41 with Extension:MobileFrontend, all sections in pages except the first section are collapsed and can't be un-collapsed. setting the <code>$wgMFCollapseSectionsByDefault</code> setting to false does not help.
Is this a bug? Is this a bug of Skin:Timeless or Extension:MobileFrontend?
If memory serves me correctly, MobileFrontend has a lot of content processing built into it. I guess the bigger question is simply: why would you be using both at the same time? Timeless is responsive out-of-the-box and should provide a nice, usable view for mobile users just as well as traditional desktop users. (I'm just trying to understand the use case here.) Regardless, it's likely more to do with MobileFrontend as MF is "actively" being developed, i.e. it's more likely to receive significant amounts of new code, whereas Timeless is currently decently feature-complete (which, contrary to popular belief, is not a bad thing at all) and thus more stable.