Yep, I came across the same reports this morning before checking here. I can confirm from yesterday that GNOME Web (epiphany-browser) also demonstrates the misplacement. Here's a test page:
https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_select -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1874047 Title: 20.04 - Software Boutique - No Filter drop-down placement To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-mate/+bug/1874047/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs