IPv6 Prefix Change - no connection - routes?

[Bytechanger]

Hi,

I´ve connected my OPNSense to a FritzBox.
I get a /60 Prefix delegation. But when the Prefix changes, OPNSense get it on it´s interface and change ip´s correct. But there is no connection anymore, until I restart OPNSense. After that, it works fine.

I think, it´s a bug?!
Are routes defect?
Can I start a script manually to reconfigure OPNSense on connection loss?

Greets

Byte