Firmware update deletes custom data screen

When the Forerunner 265 update installs itself, my custom data screens disappear. This has happened 4 times now. It's very frustrating because I only find out when I've started my next run, and the only Running data screen present is the clock.

Does anyone know how to preserve these?

What makes it even more annoying is saving the new screen often takes 5-10 attempts. Obviously there's a bug but I've no idea how to work around it.

Any advice gratefully appreciated!