Working with DNGs in Lightroom gives you the ability to install an useful plugin to recover real image size as captured by the camera sensor.
When you have a good image with some cropped pixels on one edge, you could probably recover them with this plugin:
DNG Recover Edges
The plugin will work with any camera, for example:
The RX100 recovers 248.832 pixels, from 5472x3648 to 5504x3672 pixels.
The A900 recovers 226.304 pixels, from 6048x4032 to 6080x4048 pixels.
The A99 recovers 272.768 pixels, from 6000x4000 to 6032x4024 pixels.
The A6000 recovers 385.536 pixels, from 6000x4000 to 6048x4032 pixels
The A7M3 recovers 385.536 pixels, from 6000x4000 to 6048x4032 pixels