When riding a boat on ice, the speed of a boat doesn't change. In Java and consoles, the speed is increased when on ice. I know it should be in the game. Confirmed by Helen.
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[Mod] Celesian
CrampedSpider72
Actually, Helen confirmed it should be working like in Java and Console. I posted a picture to prove it. That's her official discord account
Thank you for your report!
However, this issue has been closed as a Working as Intended.
In the Java Edition of Minecraft this is a bug, see MC-97803