NEW BUG Spoilers and post preview

So, you know how, in the new interface, you see a preview of the last post in each thread as you scroll through sections? Well, if there's a spoiler tag in that post, the text within is shown in the sections - isn't it supposed to be hidden? If not, then I'd like to suggest that; if so, then this is a bug repot because it hasn't been working for me - I just left a spoiler-tagged post in Entertainment & Media's Spider-Man: Far From Home thread, and it was visible in the section, and I looked back at my last spoilered post in the Endgame thread from May and the same thing happened. At first I wondered if you're just able to see your own spoilers, but I tried signing out and I could still see them.
EDIT: My test at the beginning of this post is also visible.