For a while Google has claimed that this shouldn’t matter (https://www.youtube.com/watch?v=WsgrSxCmMbM), but I suspect this question will come up occasionally until will try it.
Since the page title is already wrapped in a header tag, the H1 likely isn’t accomplishing much anyway.
https://github.com/discourse/discourse/pull/18201
(note that this probably won’t be reviewed or merged until next week)