[iOS 15 19A5297e] Why would location for MacBook not be visible through iCloud.com or iCloud family members under device list? Offline finding or just beta bug or feature? MacBook was stolen last night, just trying to figure out how I can only see updated location on this phone in Findmy.

Offline finding is indeed listed as a feature for iOS 15 tho.

Find My introduces new capabilities to help locate a device that has been turned off or erased, as well as live-streaming locations for family and friends who choose to share their location. Separation Alerts notify a user if they leave an AirTag, Apple device, or Find My network accessory behind in an unfamiliar location, and the Find My network now supports AirPods Pro and AirPods Max. A new Find My widget offers an at-a-glance view directly from the Home Screen. - Apple Newroom (iOS 15)

/r/iOSBeta Thread Parent