i did open a support ticket for this problem (SUP-127514) but i thought i'd ask here too in case i'm doing something wrong...
so i have a CRS309 running OSPF, with this routing table:
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> /ipv6/route/print
Flags: D - DYNAMIC; I - INACTIVE, A - ACTIVE; c - CONNECT, o - OSPF; H - HW-OFFLOADED
Columns: DST-ADDRESS, GATEWAY, DISTANCE
DST-ADDRESS GATEWAY DISTANCE
DAoH ::/0 fe80::764d:28ff:fe43:bf23%vlan4000 110
DAoH ::/96 fe80::b696:91ff:fe45:a216%vlan102 110
DAoH 2001:8b0:aab5:1::/64 fe80::764d:28ff:fe43:bf23%vlan4000 110
DAoH 2001:8b0:aab5:2::1/128 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:2::2/128 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:2::3/128 fe80::1afd:74ff:fef8:7881%vlan102 110
DAcH 2001:8b0:aab5:103::/64 vlan103 0
DAcH 2001:8b0:aab5:104::/64 vlan104 0
DAoH 2001:8b0:aab5:402::/64 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:404::/64 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:405::/64 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:406::/64 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:407::/64 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:409::/64 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:d000::1/128 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:d000::2/128 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:d000::3/128 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:d000::4/128 fe80::1afd:74ff:fef8:7881%vlan102 110
DAc 2001:8b0:aab5:d100::1/128 loopback 0
DAoH 2001:8b0:aab5:d100::2/128 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:d100::3/128 fe80::764d:28ff:fe43:bf23%vlan4000 110
DAoH 2001:8b0:aab5:d100::4/128 fe80::2ec8:1bff:fe94:96f0%vlan102 110
DAoH 2001:8b0:aab5:d100::5/128 fe80::764d:28ff:fe8e:70c6%vlan102 110
DAoH 2001:8b0:aab5:d100::6/128 fe80::c6ad:34ff:fe18:b962%vlan102 110
DAoH 2001:8b0:aab5:d100::7/128 fe80::c6ad:34ff:fe00:3da1%vlan102 110
DAoH 2001:8b0:aab5:d100::8/128 fe80::764d:28ff:fe8e:7a89%vlan102 110
DIoH 2001:8b0:aab5:fffd::/64 vlan4000 110
DAcH 2001:8b0:aab5:fffd::/64 vlan4000 0
DAoH 2001:8b0:aab5:ffff::/64 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH 2001:8b0:aab5:ffff::2/128 fe80::1afd:74ff:fef8:7881%vlan102 110
DAcH fd12:8247:a481:100::/64 vlan100 0
D oH fd12:8247:a481:102::/64 vlan102 110
DAcH fd12:8247:a481:102::/64 vlan102 0
DAoH fd12:8247:a481:102::11/128 fe80::764d:28ff:fe8e:70c6%vlan102 110
DAoH fd12:8247:a481:102::12/128 fe80::c6ad:34ff:fe18:b962%vlan102 110
DAoH fd12:8247:a481:102::13/128 fe80::c6ad:34ff:fe00:3da1%vlan102 110
DAoH fd12:8247:a481:102::16/128 fe80::2ec8:1bff:fe94:96f0%vlan102 110
DAoH fd12:8247:a481:102::17/128 fe80::1afd:74ff:fef8:7881%vlan102 110
DAoH fd12:8247:a481:102::20/128 fe80::b696:91ff:fe45:a216%vlan102 110
DAoH fd12:8247:a481:e000::/64 fe80::764d:28ff:fe43:bf23%vlan4000 110
DAoH fd12:8247:a481:fffc::/64 fe80::764d:28ff:fe43:bf23%vlan4000 110
DAoH fd12:8247:a481:fffc::1/128 fe80::764d:28ff:fe43:bf23%vlan4000 110
DAoH fd12:8247:a481:fffe::/64 fe80::b696:91ff:fe45:a216%vlan102 110
DAoH fd12:8247:a481:fffe::/128 fe80::b696:91ff:fe45:a216%vlan102 110
DAoH fd12:8247:a481:ffff::2/127 fe80::b696:91ff:fe45:a216%vlan102 110
DAoH fd12:8247:a481:ffff::2/128 fe80::b696:91ff:fe45:a216%vlan102 110
DAoH fd7d:6c63:1000:405::/64 fe80::1afd:74ff:fef8:7881%vlan102 110
DAcH fe80::%lan/64 lan 0
DAcH fe80::%vlan102/64 vlan102 0
DAcH fe80::%vlan100/64 vlan100 0
DAcH fe80::%vlan4000/64 vlan4000 0
DAcH fe80::%vlan103/64 vlan103 0
DAcH fe80::%vlan104/64 vlan104 0
DAc fe80::%loopback/64 loopback
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traceroute6 to 2001:8b0:aab5:d100::8 (2001:8b0:aab5:d100::8) from 2001:8b0:aab5:104:600f:4784:4d81:a278, 64 hops max, 12 byte packets
1 2001:8b0:aab5:104::1 0.418 ms 0.288 ms 0.258 ms
2 2001:8b0:aab5:fffd::2 0.332 ms 0.292 ms 0.275 ms
3 2001:8b0:aab5:fffd::2 0.347 ms !P 0.311 ms !P 0.294 ms !P
packets to 2001:8b0:aab5:d100::6, which is also connected via vlan102 with an identical route, go via the correct interface:
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traceroute6 to 2001:8b0:aab5:d100::6 (2001:8b0:aab5:d100::6) from 2001:8b0:aab5:104:600f:4784:4d81:a278, 64 hops max, 12 byte packets
1 2001:8b0:aab5:104::1 0.368 ms 0.228 ms 0.218 ms
2 2001:8b0:aab5:d100::6 0.498 ms 0.302 ms 0.301 ms
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> /ping 2001:8b0:aab5:d100::8
SEQ HOST SIZE TTL TIME STATUS
0 2001:8b0:aab5:d100::8 56 64 940us echo reply
1 2001:8b0:aab5:d100::8 56 64 936us echo reply
sent=2 received=2 packet-loss=0% min-rtt=936us avg-rtt=938us max-rtt=940us
> /tool/traceroute 2001:8b0:aab5:d100::8
Columns: ADDRESS, LOSS, SENT, LAST, AVG, BEST, WORST, STD-DEV
# ADDRESS LOSS SENT LAST AVG BEST WORST STD-DEV
1 2001:8b0:aab5:d100::8 0% 3 1ms 0.9 0.9 1 0