Pynq built image for custom board doesnt boot but it does with another prebuilt image

Great, thanks for letting us know. Notebooks don’t need to be included in your image. You can easily add them later if needed.
It would be great if you can make your steps/files available.
We have a wiki post for 3rd party images here: 3rd party images for Zynq boards - #3 by ombhilare999

Cathal