How can I stop the Photos app showing the "What's New Photos" screen every time I launch it?

I'm on macOS 10.13.3, and every time I launch the Photos app, I get the following screen, showing "What's New Photos". I have to click the "Get Started" button to access my library, which works every time, but is a bit of a nuisance.

This seems like a bug in the app, but perhaps there's some sort of work-around. Does anyone have any tips?

This problem eventually disappeared in some minor version upgrade of macOS Mojave I believe (possibly even the upgrade to Mojave itself). I then had the problem that occasionally Photos.app would "forget" that I had set my system photo library to one on an external drive, which was less bad, but still not ideal. Since upgrading to macOS, that problem has however been fixed too, I'm glad to say.