Turns out that 2! addresses are responsible for 2/3 of the last 5k connections....
A Belarus IPv4 and a Chinese IPv6 (until 2-3 days ago the Belarus IPv4 wasn't there and the Chinese were sitting at about 50% of the connections - seemingly randomly scanning my IPv6-space.....)
45.143.200.114 2192 connections
240e:f7:4f01:c::3 1129 connections
Is that your public IP?