OSPFv3 - why are "intra-area-prefix" LSA happening when redistribute=static is on

Where is the '“intra-area-prefix'“ coming from??? Other routers are not dishing it out “intraf-area-prefixes”, just this one. Anyone else seeing this?

/routing/ospf/lsa print where originator="172.18.5.31"
...
5  D instance=ospfv3 type="external" originator=172.18.5.31 id=0.0.0.0 sequence=0x80000004 age=466 checksum=0x3A0A 
      body=
        prefix=2607:f598:1c20::/44
        metric=1 type-1
        tag=0
8  D instance=ospfv3 area=ospfv3-0 type="intra-area-prefix" originator=172.18.5.31 id=0.0.0.0 sequence=0x800003F8 age=1117 
      checksum=0x2EC1 body=
        ref-type=router
        ref-id=0.0.0.0
        ref-router-id=172.18.5.31
            prefix=2607:f598:1c20:beef::/64 metric=1
            prefix=2607:f598:1c20:beef::beef options=LA
# OSPFD instance has 'redistribute static'
/routing/ospf/instance> print
0   name="ospfv2" version=2 vrf=main router-id=172.18.5.31
1   name="ospfv3" version=3 vrf=main router-id=172.18.5.31 redistribute=static

# And here is my only static route on the CCR2216...
/ipv6 route add blackhole disabled=no distance=1 dst-address=2607:f598:1c20::/44
/routing/ospf/instance> /ipv6/address/print 
Flags: D - DYNAMIC; G - GLOBAL, L - LINK-LOCAL
Columns: ADDRESS, INTERFACE, ADVERTISE
#    ADDRESS                       INTERFACE                   ADVERTISE
0  G 2607:f598:1c20::1/64          lo                          yes      
1 D  ::1/128                       lo                          no       
2 DL fe80::6f4:1cff:fe29:ed8/64    bridge                      no       
3 DL fe80::6f4:1cff:fe29:ed1/64    sfp06-X-Over                no       
4 DL fe80::6f4:1cff:fe29:ece/64    sfp03                       no       
5 DL fe80::6f4:1cff:fe29:ecf/64    sfp04                       no       
6 DL fe80::6f4:1cff:fe29:ec4/64    qsfp1                       no       
7 DL fe80::6f4:1cff:fe29:ecc/64    sfp01-pomelo-et8            no       
8  G 2607:f598:1c20:beef::beef/64  sfp06-X-Over                yes

Oddly, when I didn’t have the ‘beef::beef’ addresss on there (it is for testing), the router would advertise the ::1 address! Seems like the OSPFv3 is eager to advertise addresses!