ULL Issue: dns1.nextdns.io (IPv6) error (ultralow1) in Superloop ISP

There seems to be an error in ipv6 for Ultralow1. 

■ gsl-mel                   6 ms  (anycast1, ultralow1)

  zetta-mel                12 ms  (ultralow2)

  zetta-adl                16 ms

  gsl-adl                  16 ms

  zetta-syd                18 ms

  vultr-syd                18 ms

  gsl-syd                  18 ms

  vultr-syd (IPv6)         18 ms

  gsl-bne                  28 ms

  gsl-bne (IPv6)           28 ms  (anycast1)

  zetta-bne                30 ms

  zetta-per                41 ms  (anycast2)

  zetta-per (IPv6)         53 ms

  zetta-syd (IPv6)        173 ms  (anycast2)

  zetta-mel (IPv6)        186 ms  (ultralow2)

  gsl-mel (IPv6)           error

  gsl-adl (IPv6)           error

  gsl-syd (IPv6)           error

dns1.nextdns.io (IPv6) error (ultralow1)

Can you please check? Sometimes i goes to ipv4 but when it jumps to ipv6, i lose internet connection. Also the other ipv6 servers seems to be slow too.

Below is the diag:

https://nextdns.io/diag/22a86f70-d70e-11eb-b494-cd24fb854cea