TrueNAS Scale: no tailscale interface after app install - app 1.76.2, v 1.2.6

### What is the issue?

After install, Truenas appears in "machines" in tailscale’s web panel, but can't access nodes advertising subnets.
There is no tailscale’s network interface (in TrueNAS interfaces, as suggested in documentation on site).
When issuing >ip a - from container shell:
_tailscale0: mtu 1280 qdisc fq_codel state UNKNOWN group default qlen 500 link/none
inet 100.104.6.42/32 scope global tailscale0
valid_lft forever preferred_lft forever
inet6 fd7a:115c:a1e0::5d01:62a/128 scope global
valid_lft forever preferred_lft forever
inet6 fe80::e40:6e62:b888:4dd8/64 scope link stable-privacy
valid_lft forever preferred_lft forever_

From container logs:
...
_rename of "/etc/resolv.conf" to "/etc/resolv.pre-tailscale-backup.conf" failed (rename /etc/resolv.conf /etc/resolv.pre-tailscale-backup.conf: device or resource busy), falling back to copy+delete_
...
_Some peers are advertising routes but --accept-routes is false_
...

### Steps to reproduce

Install tailscale’s app. Trunas is a VM in Proxmox with 2 interfaces - one routed (internet access though firewall), one not (internal storage net).
App configured with: Accept DNS, Host network, rest settings - default.
I tried with lot's of other settings but couldn't make it work.

### Are there any recent changes that introduced the issue?

I don't know, first time user.

### OS

Other

### OS version

Truenas 24.10.1

### Tailscale version

1.2.6 (app 1.76.6)

### Other software

_No response_

### Bug report

_No response_