I notice as well that even if net.ipv6.conf.default.use_tempaddr=2 and net.ipv6.conf.all.use_tempaddr=2 and net.ipv6.conf.<interface>.use_tempaddr=2, after netplan apply is executed, net.ipv6.conf.<interface>.use_tempaddr=0 and no RFC 4941 address is present on the interface.
I notice as well that even if net.ipv6. conf.default. use_tempaddr= 2 and net.ipv6. conf.all. use_tempaddr= 2 and net.ipv6. conf.<interface >.use_tempaddr= 2, after netplan apply is executed, net.ipv6. conf.<interface >.use_tempaddr= 0 and no RFC 4941 address is present on the interface.