Query on ZAPI communication - when we have two peers advertising the same route

[sakthishanmugam02]

hi Team,

I have 3 BGP FRR routers (A, B and C). A is paired with B & C.

I have ZAPI program running in the A device to redistribute BGP routes from FRR to a Go Program.

B is advertising to A - let's say prefix: 10.10.10.0/24 with next hop as 10.10.10.10 and AS-PATH length: 6

I received a route ADD event to Go program.

C is advertising to A - the same prefix: 10.10.10.0/24 with next hop as 10.10.20.20 and AS-PATH length: 3

I received a route ADD event to Go program about the new event.

But I expect DELETE event for the B route and the ADD for C, DELETE event is missing => I expect this to happen as the best route selection is changed.

Same when I withdraw both the routes, I get only one DELETE event, not two.

Is this behaviour expected, or some logic I am missing?