At the moment i am testing the A11 based CalxyOS on a Pixel4a. The CalxyOS Camera is very basic (not to say poor ) so i extracted the Stock Android12 camera app of a Pixel3 (v.8.3.252.388784741.13) and the stock A12 camera app of a Pixel5 (v.8.4.300.414775575.18) and installed them on the Pixel4a. The Pixel5 app gives a "parsing error" but the Pixel 3 stock A12 camera app runs fine on a Pixel4a with (currently) CalyxOS V2.11.0 including the night mode, all zoom features and panaorama/portrait etc. The only thing, i cannot use the button to open the lates pic from the gallery because i do not have "Google Photos" installed and the camera app calls this. But i dont use this function anyway so i dont care about this.