This bug seems to be similar to T287191.
**List of steps to reproduce** (step by step, including full links if applicable):
* Log in
* Visit https://en.wikipedia.beta.wmflabs.org/wiki/Special:Preferences and disable the box "Use a compact language list, with languages relevant to you." at bottom of appearance section
* Use a web site like https://de.wikivoyage.org/wiki/Berlin?vectorstickyheader=1
* Click the language button
* Expected: a scrollable list should appear.
{F34881774}
**What happens?**:
* No scollable language list appears. A list is shown only if you visit incognito the article.
**What should have happened instead?**:
* Button should not appear
**Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc**:
* Firefox 95.0
# QA steps
Visit preferences and uncheck this box:
{F34891820}
Go to a page and get the sticky header to appear.
Expected: Clicking language button should scroll to the language button in the page and open the dropdown.
2) Visit preferences and check this box:
{F34891820}
Go to a page and get the sticky header to appear.
Expected: Clicking language button should open a dialog in place without scrolling the page