Yeah that's the sad part in OneUI 4.0. Gapps only get themed when you are running google's proprietary theming engine called "monet". Samsung didn't adapt google's monet since Google didn't release it for all initially. They wanted monet to be a pixel exclusive feature. So Samsung developed its own theming engine to counter that. Later google decided to roll out monet to all other oem's except Samsung. If this information was helpful kindly click the 3dots and accept it as solution
