MacOS issue commenting

I've been having an issue on MacOS where I can only comment once, and can't comment again until I refresh the app (or quit it and restart). Basically the first comment works fine, then a second comment (doesn't have to be on the same post, or even community) won't work because the text input box disappears.

I'm using it as a saved app in Safari and I'm on a beta version of MacOS (Sonoma, current dev beta) - the saved app feature is new to Sonoma.

Appreciate this isn't going to be the highest priority given I'm on a beta, but Voyager is so nice as a saved app in Sonoma in all other ways I can image lots of people wanting to do it.