I think there is a bug or edge case with the code that checks if a server allows downvoting. After updating voyager last night, I couldn't downvote any posts on .world with voyager while I could if I just used the website. My thought was that since I updated voyager while lemmy.world had some downtime it may have defaulted the downvotes_enabled setting to false.
Did you have vote view separated in the PWA, then the default combined in the test light app, so you mean you're missing the downvote button that's also the count?