Here’s one I can reproduce every time in the lastest beta.
Create two blank text documents in a Scrivener project.
Go to a browser, highlight a URL and copy it.
Paste the URL into Document 1. The text will appear blue/underlined with an active link to the URL, as expected.
Switch to the Document 2 and start typing. The text will appear blue/underlined with an active link to the URL you pasted into the other text document, which is unexpected behavior. This will also happen if Document 2 has text in it, but you start typing at the very beginning of it. If Document 2 has text in it, and you start typing anywhere other than the very beginning, the text formatting is correct and doesn’t contain the link.