Steps to replicate the issue (include links if applicable):

• Use the Vector 2022 skin with the Reading Lists beta feature enabled
• Click the bookmark icon and observe the proper functionality
• Resize your browser window to any width less than 640px
• Bookmark icon disappears (it is replaced with a text-only link)
• Click the Add/remove bookmark link in Tools dropdown menu

What happens?:

The dropdown closes, but nothing else happens.

What should have happened instead?:

• A notification should appear, indicating the page was successfully added or removed.
• The button's text should change from "Add bookmark" to "Remove bookmark" (or vice-versa)

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

The current bookmark code expects only one bookmark button on the page. It is not able to detect clicks or update the text-based link, due to it being a child of a completely different element.