When placing a Hacked Fast splitter from map view the splitter defaults back to old splitter behavior. Might be the case for the normal splitter as well

i dont think im able to fix any bugs by myself sadly

script.on_event (
{
defines.events.on_built_entity,
defines.events.on_robot_built_entity,
defines.events.script_raised_built,
defines.events.on_pre_ghost_upgraded
},
function (event)
local entity = event.entity
if is_splitter (entity) then
-- Now we'll do the same-ol' creation logic for all of our
-- splitters irrespective of type.
local splitter = add_splitter (entity)
end
end
)

all you need to do to fix it is add these two additional defines. I added them to the whole function above. its on line 136 ish and its where you currently have on built entity and on robot built entity

  defines.events.script_raised_built, 
  defines.events.on_pre_ghost_upgraded