Strange pf table "__automatic_xxxxxx_0"

[Forth]

Hi all.
What is that table? It's always recreated with new numbers in name such as __automatic_18c32924_0. pfsense also creates rule:
block drop in inet from <__automatic_18c32924_0> to any
table contains ip  pfsense own addresses from interfaces, but not all. I see only opt* interface's adresses in that table, not WAN and LAN addresses.