A bug has been reported where the “Subcategories with featured topics” view no longer shows subcategory topics on mobile devices. harryob initially reported the issue and provided screenshots. Carleas confirmed the issue with version 3.3.0.beta3-dev and has investigated possible causes, including a commit from April 23 that may be related to the issue. After further investigation, Carleas found a discrepancy between the desktop and mobile templates that could be the source of the bug. The issue has been identified and a fix has been proposed in a PR (https://github.com/discourse/discourse/pull/27715), which is currently under review.
Using the “Subcategories with featured topics” view, individual subcategories no longer show their latest topics on the /categories page.
“Subcategory subcategory” has a post in it, but this is no longer displayed on the /categories page on mobile (but it is on desktop).
I am seeing this too after a recent upgrade, version 3.3.0.beta3-dev (61610a61fa).
On Android mobile, both Firefox and Chrome.
EDIT: I thought I’d found a workaround, but it doesn’t persist. Might help troubleshoot, though:
Check “Show subcategory list above topics in this category.” box in the parent category’s settings (“Subcategory List Style” doesn’t matter), then go to the All Categories page, and click on the parent category, and then navigate back to the all categories page. The subcategories in that parent category now show up correctly.
But refreshing the page reverts the fix until the next time you go to the parent category.
This wasn’t fixed with the update to beta4.
I’ve been looking through recent commits, and I see from April 23 commit #d2a52c3, “FIX: Use serialized subcategories in subcategory-with-featured-topics”, which fits my timeline and seems like it could be related to this issue.
This commit updates app/components/subcategories-with-featured-topics.hbs to replace category.subcategories with category.serializedSubcategories, but I noticed that app/templates/mobile/components/subcategories-with-featured-topics.hbs still has category.subcategory.
Is that anything? Sorry if this is nonsense, I’m well out of my depth looking through the code, just trying to do what I can to help track down the issue 
Hello @harryob! 
Thank you for the bug report. We have identified the issue and have fixed it in this PR:
https://github.com/discourse/discourse/pull/27715
It is currently under review and will be merged soon. After that, you can update your site and fix your issue.
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