Non-autoconfirmed users cannot save external links with the new topic tool from DiscussionTools.
If you write an external link and click the blue "Add topic" button then it turns grey for a second and there are moving diagonal lines in the text area. Nothing else happens. There is no CAPTCHA or error message and nothing is saved.
It was reported 9 September 2024 at https://en.wikipedia.org/w/index.php?title=Wikipedia:Teahouse&oldid=1245763610#Some_of_my_students_cannot_post_external_links_to_my_talk_page
Screenshot from https://en.wikipedia.org/wiki/Wikipedia_talk:Sandbox attached. Made in Firefox with Vector 2022 in the non-autoconfirmed account https://en.wikipedia.org/wiki/User:PrimeHunter3. The tested link is https://example.com. The same happens for IP's.
Captchas appear as expected with the reply tool.