Testing the new Delegated-IPv6-Prefix via PPPoE software version 6.48

First PPPoE authentication is successful - prefix is assigned from RADIUS

When a second user dials up. There is an error:

could not add dhcpv6 server with pool : server with such name already exists (7)

This seems to stem from the fact the dynamically created DHCPv6 server has no name. Any ideas?

found the same bug
script helped
On Up:
/ipv6 dhcp-server remove 0;

I am trying the same setup on 6.48.3 and the bug is still there.
Does the workaround provided by @hlaaluu really works?

Anyway I see that in latest 6.49 beta the bug is fixed. Let's wait for a stable release.