Looks like an issue related to this as well, and it was never fixed Zapier Youtube to Webflow CMS url don't work - #2 by samliew
For some reason Webflow’s CMS screws the links and paragraph breaks when they are sent via Zapier. Making a slightest edit to the link or text and saving the item again fixes the issue, which of course is not a solution, because it undermines the idea of automation.
I have been waiting for a fix for this since 2015, especially for youtube video walls we design for our clients.