Here's a little fix that you can try out for Google Play Services Bug On Galaxy Watch 6
A Google Play Services bug has been discovered to be draining battery life on Galaxy Watch 6 smartwatches. The bug is causing Google Play Services to consume an abnormally high amount of battery power, even when the watch is not in use.
This issue has been reported by numerous Galaxy Watch 6 users on various forums and social media platforms. Users have reported that their watch's battery life has been reduced by up to 50% since the bug began to manifest itself.
The bug appears to be related to the way that Google Play Services handles background tasks on the Galaxy Watch 6. It is speculated that the bug is causing Google Play Services to constantly wake up the watch's processor, even when the watch is idle. This is leading to excessive battery drain.
Fortunately there’s still a little fix that you can try out for your Galaxy Watch 6. Basically you have to clear out cache of your Galaxy Watch as shared in above video. You can check out the above video for a step by step guide on how to do it.