They changed the laws a few years ago because agents were doing this to get greater interest in auctions. The problem though is something like this is hard to enforce.
I remember a few years ago (2015) before I bought my current house, I went to look at a house in a suburb 15km from the CDB. The real estate agent said he predicts $980,000. I made an offer of $1,150,000. The owners did not accept it.
Talk about under-praising... the house went for $1,325,000.
From that moment on, I had no respect for that guy and did not bother attending any of his open houses.