Just got my ASUS RT-AX89X installed with bahnhof fibre. Before I had another ASUS with a fibre converter.
Now the RT-AX89X has an SFP port so I took the SFP from the converter and installed it in the ASUS.
Much cleaner config.
Now I have Bahnhof network fibre that connects to their own switch and the SFP in my router.
That means I can avoid the telia equipment and get native ipv6. Highly recomended.