This started with the most recent update and happens on all text posts. I can’t see behind images or the comments though.

Edit: here’s how this post looked after posting

The image

  • Maven (famous)OPEnglish
    3•7 months ago

    I haven’t messed with the theme. Purely default for all I know.

    • Max-PEnglish
      1•7 months ago

      Any phone-wide themes that uses transparency by chance?

      The default theme AFAIK uses Material You and just pulls the settings from your phone.

      Mine’s all fully opaque.

      • Max-PEnglish
        1•7 months ago

        Surely it’s some sort of overlay so the swipe right gesture works correctly: