hey,2000::/6 with aspath 3257 3549 has appeared in global routing table. Surely we can't be only ones seeing it. Looks like someone messed up interface/route config at 3549 by omitting 4 from the prefixlen.
According to https://stat.ripe.net/2000%3A%3A%2F6#tabId=routing "2000::/6 is visible by 79% of 92 IPv6 RIS full peers." -- tarko