Updating a blueprint with a bulk rail loader (or unloader) fails to copy the entity correctly.

[awdwyn]

Originally I thought this was an issue with the build rail loaders themselves, however it seems to only come up on blueprints that have been touched by this mod (using Shift+U to update a blueprint)

Link to relevant thread on Bulk Rail Loaders discussion page: (https://mods.factorio.com/mod/railloader/discussion/5d2b183d0fc4c9000b76e3e6) - including screenshots and save game

[mspielberg]

You can probably fix this by raising on_player_setup_blueprint after your call to create_blueprint.