Hi

I have recently developed Minecraft mod, that exports world portions, which then are imported with my Blender addon into Blender scene. The idea was to be able to export modded minecraft worlds. Currently it proved to work nicely. But there are 2 majior drawbacks:
1) It does not export paintings, armor stands and item frames.
2) It does not export blocks, that use custom renderers (like chisel and bits mod blocks)

My approach is that I ask minecraft renderers (BlockRenderDispatcher, BlockEntityRenderDispatcher) to render what they see at some block position into my custom VertexConsumer classes.

Seems like I am missing some other types of renderes.

How paintings, armor stands and item frames render themselves? Can I somehow access renderers, that are introduced by other mods?

The 3 you list are entities, so the EntityRendererDispatcher should handle them.

For the chisel and bits thing you will have to look at what it is doing that is non-standard.