Factorio Forums

From https://lua-api.factorio.com/latest/cla ... ecord.html

Records in the "my blueprints" shelf are read-only, but records in the "game blueprints" shelf are read/write.

I'm absolutely able to modify records in "my blueprints" inside the on_player_setup_blueprint event. Is this piece of information outdated or is that event an exception?

That event is an exception. Thanks for noting it, I've updated the docs for the next release.