Oh I dont know whats the story with those four listeners.
It didnt used to in the past:
EDIT: Oh the four listeners might be a local thing!
If I check on my Raspi's instead of above tinker VM of mine (Pi-OS Bookworm vs Debian Bookworm):
@ph6a:~ $ sudo ss -nltup sport 5335
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port Process
udp UNCONN 0 0 127.0.0.1:5335 0.0.0.0:* users:(("unbound",pid=28907,fd=3))
tcp LISTEN 0 256 127.0.0.1:5335 0.0.0.0:* users:(("unbound",pid=28907,fd=4))
@ph6b:~ $ sudo ss -nltup sport 5335
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port Process
udp UNCONN 0 0 127.0.0.1:5335 0.0.0.0:* users:(("unbound",pid=2403,fd=3))
tcp LISTEN 0 256 127.0.0.1:5335 0.0.0.0:* users:(("unbound",pid=2403,fd=4))
I'll investigate later.