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Random thought on this. I think most modern mobiles and Rapsberry Pi tend to use locally generated (spoofed) mac addresses now days. These can change when you update/reimage a system. I know my Galaxy s10 changes mac addresses after major updates. Pretty sure my Pi4 devices do too. I could be wrong though, its not something I've paid attention to.
If your DHCP lease was still valid, it might detect an upgraded device as a new device if the Mac has changed hence the new DHCP lease.
Stonehedge
NotThamesWater
Perhaps an Android question just system upgraded my phone and all my pi to mobile hotspot 192.168. addresses are now different.
I guess that's normal, just wondering why it'd not keep the old ones?