Pages is crashing on startup

I’m trying to run Pages on a M1 Mac mini. I’ve been using Pages for a long time, and I’m quite sure I’ve successfully done so on the Mac Mini, but not for a couple of months. It briefly puts up the file picker dialog and then shuts down. This happens both when I click on the Pages icon in the dock and when I click on a Pages file in the Finder. I’ve installed the latest release of Pages to no effect.

Solved. I thought that Big Sur was up to date, since I hadn’t got any update notification, but I was on 11.2.1! Update to 11.4 fixed the problem.