Geomap: svg icon background circle even for transparent background

Hello there,

I am using Grafana V12.0.1(OSS) after upgrading from V10.4.19(OSS). My Geomap is showing a grey circle as background for svg icon (/img/icons/unicons/truck.svg). I even tried using custom svg file(with transparent background in svg) but still I am seeing background grey color(which I do not want as it looks messy). Attaching image for reference. there can be more than one point closely located.

in Grafana v10.4.19

in Grafana V12.0.1

Am I doing anything are wrong? Any Help would be appreciated.