IPv6 connectivity not restored after dslmodem reset/remote-hangup

[donald24]

I noticed yesterday after I rebooted my dsl-modem, that both my internal IPv6-tracking interfaces were not getting IPv6-adresses through my dial-up interface (PPPoE). IPv4 was fine. This also happens when my ISP forces a disconnect every once a while, requiring an automatic redial.
The delegated prefix (56) is correctly handed out on the adapter though.

To restore IPv6 functionality I usually open the dial-up interface details, save without any changes, and apply it. Then the IPv6 addresses get handed out on the tracking interfaces.

Currently running on the latest 19.7.5. build.

What can I do to make this more reliable?