Anyone have an IPv6 /60 or /56 on residential internet?

I'm new to Xfinity and just placed my Xfinity router into bridge mode. My previous network on a different provider had a IPv6 prefix delegation of /56 and everything worked great for setting up VLANs on their own /64 to isolate guest and IOT from my regular endpoints.

My Xfinity gateway status page says I have a prefix delegation of /60 but my router is only getting a /64 (with a different prefix than shown on the Xfinity status page). Being a /64 prefix, I am unable subnet the IPv6 with SLAAC/RDNSS or similar.

Any thoughts on how to get a /60 from folks who have already done this?