I am currently using a Realme device which runs on Android 13, When i set my app icons to match wallpapers color a few of them are staying as they are as shown in the screenshot. Is there any way to customise these aswell with the help of any 3rd party apps? This just doesn't look right.
This is what I do. I use Kvaesitso and it is a search based launcher that has a setting to force material you icon theming that usually works well. Other than that I am not sure how you would force it with the regular android launchers
Basically not all apps support it. The developer of the app must update his app to support it.
Secondly there are icon packs you can buy where the dev of the icons manually created all of them.
But even there, some apps will still be in their normal colour because he hasn't made an icon for that app yet.
Most people just remove the apps from the home screen and leave only the themed apps
You will need an icon pack and/or a 3rd party launcher application. Pix Material You Light/Dark(paid) should fit the bill. Smart launcher 6 also has an option for themed icons.