Could someone advise why shapping does not work for IPv6 ?
Probably because router can’t guess that it should use queue for 192.168.0.18 also for 2a00:1450:4014:2:
443. 
Well thank you for the answer. That makes sense.
I had no idea that the client (win10) is connected simultaneously via IPv4 and IPv6.
So set in queue for one client two IP addresses?
Or assign only one, IPv4 or IPv6. So the second shut down in the ip / dhcp server.
Which way is better? How do ISPs set it up?
Thank you.
It’s normal to have both IPv4 and IPv6 addresses at the same time. IPv6 does not completely replace IPv4.
One problem can be that IPv6 addresses tend to be less static than IPv4 ones. With IPv4 it’s usually your LAN with some 192.168.x.x, exactly as you have it. You add DHCP reservation for MAC address and device always gets its one static IP address. With IPv6 it starts with prefix from ISP, which is often dynamic, then there are so called Privacy Extensions, which means that devices get new addresses all the time. And since I don’t do much with queues, I don’t know what’s current best solution for that. But judging by the right part of your address, it looks like it could be static, so if it’s the case, adding it as second one to queue should be enough.
Try to put ipv6 /64 prefix per LAN in simple queue. I’ll try it later.