Threadso, I guess, based on reply above, I should read immutable from schema and mutable on the old_mutable field?

ACTION logburnasset( name asset_owner, uint64_t asset_id, name collection_name, name schema_name, int32_t template_id, vector <asset> backed_tokens, ATTRIBUTE_MAP old_immutable_data, ATTRIBUTE_MAP old_mutable_data, name asset_ram_payer );