since we don't use `file.add` to add inverse items and we use `file.create_entity` it was duplicating new elements, added optional parameter that makes it possible to track already added relationships between `append_asset`s.
issue occurred with ifcpatch ExtractElements - it was adding project from other ifc file (with the contexts) and then adding some elements from it using `append_asset`. During `append_asset` it was considering existing context with the duplicated one and was partially purging it.
as probably in the most cases user would want 1 style per 1 representation item
After this it's finally possible in BBIM to assign styles to representation items through the materials: https://imgur.com/a/cgiJ1KV