[whpalmer4]

I got it to undo the link, but upon further experimentation, it comes back when I deselect the action. It does seem to work properly with links that have a title other than the URL, but of course that isn't much consolation for you. I was able to add strings that look like URLs without having them made into links by editing the database directly, but a) that isn't very practical, and b) as soon as you do anything with the note, they get converted to links.

I would use Help->Send Feedback to contact Omni and ask if there is a hidden configuration option that would disable the automatic text->link conversion, and request the feature if there isn't.