I using Enigmatic Graves fork and Accessories with Curios Compat and I noticed that when you die the accessories items don't go into the grave, they just fall out. Moreover, they are duped when you return the items from the grave.

I used the latest versions of both mods on 1.20.1

Ah, I see they do not iterate and collect the items. Instead, they copy the data here, which is not really supported in the 1.20.1 version of the CCLayer. Overall not much to be done as support for 1.20.1 has been dropped in favor of 1.21.1 and the latest Minecraft version.

@Margatroidu If your willing you could try to use YIGD with connector to have support as such contains builtin support for Accessories

Any amount of info dealing with the Accessories Version, the Version of the compat layer and the given Minecraft version combined with the version of Enigmatic Graves fork would be helpful