With hashbang URL only
When a link is the only item within a Note widget (randomly occurs)

Steps to replicate:

1.) Create a link
2.) Set the URL in the link modal to "#" (no quotes) or make sure this is the only link in the Note Widget
3.) Select the link (click and drag)
4.) "Remove Link" button doesn't appear

Current Workaround:

1.) Create a link
2.) Set the URL in the link modal to "#" (no quotes) or make sure this is the only link in the Note Widget
3.) Select the link (click and drag)
4.) Click on the "Add Link" button, remove the URL, save