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 Is this piece of information outdated or is that event an exception?Records in the "my blueprints" shelf are read-only, but records in the "game blueprints" shelf are read/write.
LuaRecord read-only information
LuaRecord read-only information
From https://lua-api.factorio.com/latest/cla ... ecord.html
Re: LuaRecord read-only information
That event is an exception. Thanks for noting it, I've updated the docs for the next release.
I'm an admin over at https://wiki.factorio.com. Feel free to contact me if there's anything wrong (or right) with it.

