Leaking DNS on AR300M router

Hello,

I think DNS are leaking on router AR300M(Version 3.203). Kill switch is on. If I disable VPN(open VPN) or VPN drop and try command nslookup result looks like this:

***nslookup

Server: 127.0.0.53

Address: 127.0.0.53#53

Non-authoritative answer:

Name:

Address: 142.250.181.238

But it should look like this:

*nslookup google

Server: 127.0.0.53

Address: 127.0.0.53#53

** server can’t find google REFUSED

Second question?
Which firmware use to install Open WRT from Index of /releases/21.02.0/targets/ath79/nand/ site.?
glinet_gl-ar300m-nand-initramfs-kernel.bin or glinet_gl-ar300m-nand-squashfs-factory.img or glinet_gl-ar300m-nand-squashfs-sysupgrade.bin

You are right. The Killswitch does not stop DNS.