2022.04.05 14:49 "Re: [Tiff] Reading miscoded custom field array via libtiff", by Rob Tillaart

Before anything else make a working copy of the file.

This is what I would do

Find a hexeditor and try to verify if the missing data is indeed in the file. (Can it be overwritten by other tags etc? )

If the file contains the data you might be able to patch the length in the appropriate tag with the hexeditor. Or you might need to adjust the size 8 16 32 bit, if the error is not in the length.

If patching does not work you might need to extract the data e.g. with a python script. Find begin end of the array and write it as binary or convert to CSV whatever suits.