The short answer is yes.
B.C. is the only one I knew about. I didn't know about Manitoba and Alberta. B.C. was very interesting because it was clearly designed by opponents of the CCF to prevent them from gaining office in the 1950 or 1951 election. Social Credit came out of nowhere with W.A.C. Bennett. He was elected to a minority government, and he then immediately, within six months, called another election, changed the electoral system again, and stayed in office for quite a while.
The assumption—and I think it's a valid assumption—is that parties are rational actors and they propose changes in the law in ordinary legislation or in this kind of legislation, which is not ordinary, because they see it will benefit them or their supporters. There's nothing sinister about that. That's the way politics works. I don't think it should be surprising.
Then bringing in a referendum adds another element of what's unknown. Who knows what the result of a referendum would be? All of the misinformation and propaganda that goes on during elections would be intensified, I think, in a referendum campaign.