Extra route IP disappearing from FIB when router associated to VPN

STEPS:

1. Create Network,Subnet(IPv4),Port and boot VM.
2. Create Router and attach subnet to it.
3. Check FIB entries are populated. --> PASS
4. Create Extra route and check FIB entries are updated. --> PASS
5. Create L3VPN and Associate router to it and check FIB entries are observed --> FAIL
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