Can't rename tab group favorites in Safari

I've created two tab groups and saved some websites to bookmarks under their "tab group favorites". When I right-click and choose "rename", type a new name, and press enter, it initially seems to have worked, however just quitting Safari and re-opening it shows those bookmarks still with the old names. Doing it through the app menus rather than the sidebar had the same result.

I'm on a M1 MacBook Pro, Sonoma 14.2.1, Safari 17.2.1. I've already tried disabling all Safari extensions and trying again, and it did not make a difference.

Edit: The post says I'm on macOS 12.4, I'm not. I must've chosen my old MacBook from the device list.