MacRumors published a story that Apple has released the third beta of watchOS 6.1.2 to the developers.

Apple Seeds Third Beta of watchOS 6.1.2 to Developers

Apple today seeded the third beta of an upcoming watchOS 6.1.2 update to developers, one week after releasing the second beta and more than a month after releasing the watchOS 6.1.1 update with bug fixes. Once the proper configuration profile has been installed from the Apple Developer Center, the new watchOS beta can be downloaded through the dedicated Apple Watch app on the iPhone by going to General > Software Update.

Apple Seeds Third Beta of watchOS 6.1.2 to Developers