The spoiler tag doesn’t seem to work correctly on the mobile app (Jerboa):

Don’t worry, we won’t really need a spoiler tag for the foreseeable future.

FYI spoiler tags don’t work on the Jerboa app.

Working in the web browser - nice idea though.

Spoiler feature appears to be Non-Functional on the mobile applications Mlem and Jerboa

When I open the post it shows the spoiler, but just browsing through my feed it showed “Lemmy wins” in the preview. Using the website on mobile

It works on this page but not in the feed, there I saw the raw code instead (when viewing it in a mobile browser)