Steps to reproduce:
1: Search for something with a "stack overflow" list, for instance, "does lua not have switch statements".
2: In the popping up list widget, press the "second page" button, and then click the "first page" button.
3: The "first page" button should dissapear.
4: You can click on the first page button again, and it should appear.
The button selects correctly, and does not require a second click to appear
Firefox 96.0.2 / International / Europe West