IPv4 subnet mask entry not getting removed when L3VPN deleted

1. Create Network with 2 subnet. (One IPv4 and One IPv6) - dualstack.
2. Create router, addinterface and boot VM.
3. Create L3VPN and asscoiate router to it.
4. Delete L3VPN and check IPv4 entries and corresponding subnet mask removed.

Observation:

opendaylight-user@root>fib-show
   RD       Prefix                NextHop               Label    Origin
   -------------------------------------------------------------------
   100:1    10.1.1.0/24           11.1.1.43             100001   c
   42d78a7b-a03f-47f5-a0bd-fc0dcf773ce7  2001:db8:1234::1/128  0.0.0.0               100005   l
   42d78a7b-a03f-47f5-a0bd-fc0dcf773ce7  2001:db8:1234:0:f816:3eff:fe6f:7a5/128  11.1.1.43             100007   l
   42d78a7b-a03f-47f5-a0bd-fc0dcf773ce7  2001:db8:1234:0:f816:3eff:fe77:a02/128  11.1.1.44             100003   l
   42d78a7b-a03f-47f5-a0bd-fc0dcf773ce7  2001:db8:1234:0:f816:3eff:fe99:efac/128  11.1.1.44             100006   l
   42d78a7b-a03f-47f5-a0bd-fc0dcf773ce7  2001:db8:1234:0:f816:3eff:fe60:2e54/128  11.1.1.43             100002   l