OpenWrt (ubus) device tracker does not expose in_zones and the Home zone no longer works

I got the same issue as 2026.7 Zone / Person changes are broken? but with another tracker. I use OpenWrt ubus (OpenWrt (ubus) - Home Assistant). It does not seem to expose any zone in in_zones. For that reason all my integrations based on the home zone break.

Are there any hidden/undocumented settings for the tracker I could set to fix this?

Can I somehow downgrade HA to 2026.6 without loosing data?