According to an article at Ballot Access News yesterday, the California Senate Elections Committee unanimously passed AB 1413, which makes several changes to the “top-two” system.
Among the changes is getting rid of the write-in space in elections for Congress and state office. Under Top Two (prop 14), those votes would not be counted.
Nevada, Hawaii, South Dakota and Oklahoma have never had write-in votes, and Louisiana did but no longer does.
Florida and Ohio got rid of write-in spaces in the past, but had them restored by the courts.
The bill also makes some other changes to the top two system, including requiring all candidates to list a party preference (according to Jim Riley in BAN comments).