Yes, I've been meaning to look into that. I recall about 5 years ago Windows started randominsing MAC's, however only did so when probing. For a given SSID I always saw the same MAC presented by a client. I just found the below, looks like Apple have adopted a similar approach: To reduce this privacy risk, iOS 14, iPadOS 14 and watchOS 7 use a different MAC address for each Wi-Fi network. This unique, static MAC address is your device's private Wi-Fi address for that network only. https://support.apple.com/en-au/HT211227
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