Home Assistant in a container breaks Fasttrack?

Is there anyone running Home Assistant in a container?

I noticed that as soon as (actually, about a minute later) I start the HA container on RDS2216 (without even any setup, no mounts, no env variables etc – just add the container and start it right away), the Fasttack becomes inactive in both /ip/settings print and /ipv6/settings print. It gets back to normal when I stop the container. Guess HA does something weird with the network interface. I got about 20 other containers, none of which have this issue.

It behaves the same in 7.19 and 7.20 branches, didn’t try anything older.

Wonder if it is just me or not.

I can post my config, and I will if required / if Fasttrack works for others, but for now I’ll skip it as it is quite long.