Fx8p telephoto cameras are 3x and 6x. Best digital zoom image quality is multiple of 3 or 6.When the light is not ideal, e.g. indoor or evening time, the zoomed pics beyond 5x look like water painting. Esp the faces of people.
I think the phone may use digital zoom of the main camera in low light. Look at the aperture f number of the photo. F1.6 are main camera while telephoto cameras are f2.6 and f4.3.
Try to disable the telephoto auto switch to digital zoom of main camera in low light option if available in camera app settings to force use of the telephoto cameras in low light.
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