Junos OS

show version 
Hostname: ACX7100-1
Model: ACX7100-32C
Junos: 22.2R1.12-EVO
Yocto: 3.0.2
Linux Kernel: 5.2.60-yocto-standard-g34a7a87
JUNOS-EVO OS 64-bit [junos-evo-install-acx-f-x86-64-22.2R1.12-EVO]

Looks like apply-path stranza is no working.
I'm try to create BGP filter on loopback.
Filter is inspired by Day One book:

# show interfaces lo0 
unit 0 {
    family inet {
        filter {
            input-list [ Accept-BGP Accept-ICMP Accept-SSH-OOBManagement ];
        }
        address 172.16.0.2/32;
    }

##
## 'iBGPPeersConfigured' was inherited from group 'PrefixList-Defaults'
##
prefix-list iBGPPeersConfigured {
    ##
    ## 'protocols bgp group RR neighbor <*>' was inherited from group 'PrefixList-Defaults'
    ## apply-path was expanded to:
    ##     172.16.0.22/32; 
    ##     172.16.0.51/32; 
    ##
    apply-path "protocols bgp group RR neighbor <*>";
}
##
## 'iBGPLocalAddress' was inherited from group 'PrefixList-Defaults'
##
prefix-list iBGPLocalAddress {
    ##
    ## 'protocols bgp group RR local-address <*>' was inherited from group 'PrefixList-Defaults'
    ## apply-path was expanded to:
    ##     172.16.0.2/32; 
    ##
    apply-path "protocols bgp group RR local-address <*>";
}

# show groups FirewalFilters-Default firewall family inet filter Accept-BGP 
interface-specific;
term active {
    from {
        source-prefix-list {
            iBGPPeersConfigured;
        }
        destination-prefix-list {
            iBGPLocalAddress;
        }
        protocol tcp;
        source-port 49152-65535;
        destination-port bgp;
    }
    then accept;
}
term established {
    from {
        destination-prefix-list {
            iBGPLocalAddress;
        }
        protocol tcp;
        source-port [ bgp 49152-65535 ];
        tcp-established;
    }
    then accept;
}

# run show bgp summary 
Threading mode: BGP I/O
Default eBGP mode: advertise - accept, receive - accept
Groups: 1 Peers: 2 Down peers: 2
Table          Tot Paths  Act Paths Suppressed    History Damp State    Pending
inet.0               
                       0          0          0          0          0          0
inet6.0              
                       0          0          0          0          0          0
bgp.l3vpn.0          
                       0          0          0          0          0          0
bgp.l3vpn-inet6.0    
                       0          0          0          0          0          0
bgp.evpn.0           
                       0          0          0          0          0          0
inet6.3              
                       0          0          0          0          0          0
Peer                     AS      InPkt     OutPkt    OutQ   Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
172.16.0.22            44600          0          0       0      31        3:53 Connect
172.16.0.51            44600          0          0       0       3        3:53 Connect

If I move to use hard coded prefix list, all becomes normal

172.16.0.22            44600          7          6       0      31          48 Establ
172.16.0.51            44600          9          6       0       3          58 Establ

[edit]
prefix-list iBGPLocalAddress {
    172.16.0.2/32;
}
prefix-list iBGPPeersConfigured {
    172.16.0.11/32;
    172.16.0.12/32;
    172.16.0.21/32;
    172.16.0.22/32;
    172.16.0.31/32;
    172.16.0.41/32;
    172.16.0.61/32;
}

Just interesting, this is bug or feature