Does Little Little Snitch 4 block connections during login?
From Little Snitch itself…

Login Connections
While no user is logged in or a login is in progress, Little Snitch
cannot display Connection Alerts. It therefore creates suggestions for
all connection attempts that occur during that time.
See the Little Snitch Help, chapter Rule suggestions for more
information.


&amp; detail from just the first entry in that table…

On 27 10 2019, ARDAgent tried to establish a connection to
100.102.5.131. The request was denied automatically during login.

So, yes, it will block attempts by default until you edit the suggestions into actual approved rules.