watchOS 27.2 beta 2 restores the Apple Watch App Switcher with a new Side button gesture, although Apple has not documented this beta change.
watchOS Beta
Apple Releases watchOS 27.2 beta 2, Here's What You Need to Know
Apple has released watchOS 27.2 beta 2 with build 24S5091f for developers, while its current release notes focus on StoreKit Testing fixes and one issue.