@SlackAPI thanks for checking -- yes all urls that were posted before yesterday via webhook in text bodies using <link-url | link text> format are not rendering as links in desktop or web apps, but still work in mobile (iOS) app.
@SlackAPI did I miss a change announcement? All formatted links in webhook text bodies (implicit markdown) are now being rendered just the description text in App and web, but not mobile app. Changing new messages to use block-kit structure fixes the symptom. But why??
A year to the day since I last tweeted, as we were about to go into coronavirus lockdown. I feel a bit like Rip van Winkle, but less European (thanks a lot #Brexit).