On the heels of Apple’s most recent set of releases, Apple has released Watch OS 8.4.1. This update is limited to only Series 4 Watches and newer, so Series 3 users won’t seeing it on their Watches. As to what it fixes, though, that is unclear. Apple says only that it affects bugs affect Series 4 and newer Watches, and there are no security updates attached to it on Apple’s security page either. If there is any further news I’ll make sure to post it, but at this time the only patch notes are as follows.
watchOS 8.4.1 includes bug fixes for Apple Watch Series 4 and later.
For information on the security content of Apple software updates, please visit this website: https://support.apple.com/HT201222