Created attachment 460083 [details]
position:sticky;right:0 doesn't work consistently in a direction:rtl element
This seems to be a Webkit issue that has been inherited into Blink. The same bug is filed there.
Created attachment 460084 [details]
Screenshot of the problem
This is a testcase that should be added to interop-2021.
Chromium issue https://bugs.chromium.org/p/chromium/issues/detail?id=1334508&q=sticky%20rtl&can=1