I have previously created asset gallery with hou.qt, but that no longer works with houdini 20.5.
Now I have to use hou.AssetGalleryDataSource which seems much more complicated.
The issue seems to be the blinddata. Does anyone know how to add this?

I have tried the top node as well, but there seems to be no way of preventing it from generating a new icon every time. This becomes an issue when adding many items as this process is extremely slow