Even tho am using proton VPN (free) with private dns enabled. dnsotls-ds.metric.gstatic.com this domain directly connects to my real isp and leaks my real location.

Am using private dns in order to block trackers in my bloated phone. (Debloating is not an option for me as i lack a laptop and bootlocker is not unlocked, i tried many ways to debloat but all i can do is disable system apps) I don’t installed any proprietary apps even whatsapp or banking apps to never sent my data to them. The issue is just system apps trackers. Am using ironfox with ublock and tor with noscript.

Any way to prevent this vpn leak ?

My threat model is to hide my traffic from isp as my isp is a spyware privacy invader.