Ole Troan wrote on 21/06/2021 11:11:

To be correct; it's an operational issue. SLAAC works as designed with IPv6 renumbering.

slaac - being stateless 'n all - was not designed with flash renumbering in mind because flash renumbering needs some degree of state synchronisation on all devices on the path between the provisioning system issuing the prefix and the end device. So in this sense it is a protocol issue, albeit an issue that was outside the design scope of the protocol.

Imagine if the mobile operator swapped your mobile phone number midstream.

mobile phone numbers are stateful. You don't need to change phone number every time you're handed off to a different cell. Nick