Why is my Apple Watch 8 not tracking flights climbed?

The first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:

How to restart your Apple Watch - Apple Support

Restart your iPhone - Apple Support

If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This should result in no loss of data. It deletes all temp and corrupted files and re-indexes the file system.

Unpair and erase your Apple Watch - Apple Support

Set up your Apple Watch - Apple Support

This is a recent bug with iOS. The fitness app on the iPhone will not display the floors climbed. However, your watch will still track flights climbed. The fitness app on your watch and the health app on your iPhone both still show the floors climbed, only the fitness app on the iPhone doesn’t.