"Custom sort order" not syncing with Nextcloud

[alvaroemtnez]

Describe the bug
Hi! I just added my Nextcloud server and noticed that the tasks inside a project when selecting "Custom Sort Order" don't display the same order as in the "Manual Sort" in Nextcloud WebUI. I don't know if I configured something wrong, as every other reminders app in GNOME shows a different order for my tasks. However, when I add my Nextcloud server as CalDAV to the stock Reminders app in iOS and macOS, the order is the same as in the Nextcloud WebUI.

To Reproduce
Steps to reproduce the behavior:

1. Add a Nextcloud server.
2. Check the task order inside any project and compare it to the task order in the equivalent task list in Nextcloud.
3. Planify shows an arbitrary order different to the Nextcloud "Manual Sort" task order in the server's website.

Expected behavior
Custom sort order should be synced with Nextcloud's "Manual" sort order.

Screenshots
NOTE: I added 4 reminders, then changed the order on nextcloud's WebUI. The reminders app in macOS displays the new order (so it can actually be synced), but Planify in Fedora doesn't.

Desktop (please complete the following information):

• OS or DE: Fedora Linux 40 (Workstation Edition) + GNOME 46.1
• Version 6.8.7-300.fc40.aarch64