Events created in Simple Calendar don't show up in other apps (DAVx5, Nextcloud)

[whatisthisidont]

Events created in Simple Calendar appear on the Nextcloud web calendar, but not on any other app (Fantastical, Morgen, Busycal.)

Events created in Etar don't have the same problem.

Android 14, Pixel 6a Simple Calendar 6.23.1] DAVx5 4.3.9-ose Nextcloud: Woelkli Community