Would it make more sense for the mobile team to fix this bug or the wikidata team?

I think the next step is figuring out why they are not shown. And for that the mobile team is probably better.

They are not shown because we hid them.... (not showing them is better than showing them broken)
http://wikidata.org/wiki/MediaWiki:Mobile.css

It's one of my personal objectives to fix all this but you told me you were doing a frontend rewrite so I'm waiting on that to be complete before continuing...

(.wb-snaklistview is display:none;}
FWIW personally I think this show be hidden by default on mobile and revealable - the interface can look very cluttered on a long article when we show all the qualifiers

Aha! Ok. Makes sense.
And yes. Still the case. It really depends how much work this is going to be for you to fix. I don't want to make you spent ages on this obviously. But otoh the UI rewrite is ongoing and will still take quite a while. So if it is fixable with little effort go for it. If it is a week of work or more then I'd say let's not bother.

In T85366#982792, @Jdlrobson wrote:

(.wb-snaklistview is display:none;}
FWIW personally I think this show be hidden by default on mobile and revealable - the interface can look very cluttered on a long article when we show all the qualifiers

It can be very cluttered indeed. The thing is without qualifiers statements can actually be wrong. Like "mayor of foo is bar" can be a list of 50 people but only one of them is the actual current mayor. And you will only be able to tell which one is the current one based on the qualifier and rank. Probably needs some testing to see how much of an issue this really us during actual usage.