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I'm facing a very similar issue to the one encountered by this users:
https://www.syncfusion.com/feedback/27234/ribbon-designer-not-working-in-net-5
and here too
In design mode, I can even add the RibbonControlAdv component to the screen, but I can't create any RibbonPanel or button inside my component (just as I can create it in the .Net Framework perfectly). The action helper button also does not appear in this component using .Net Core, unlike the .Net Framework which works perfectly. I've already tested with .Net Core 6 and 8, and the feature doesn't work the same in both. I tested it on .Net Framework 4.8 and it works as expected.
To simulate:
1 - Create a project with .Net Core 6 or 8;
2 - Add a RibbonControlAdv to your form;
3 - The Ribbon itself is added perfectly, but try adding an item to the Ribbon. You won't make it. Where is the Smart Tag too?
Any prospects for fixing this? The components are excellent, but this very critical bug (which seems to have existed since the beginning of .Net Core) has not been fixed yet. :(