One advice is to make sure to keep the data the same length.
If that doesn't help, observe the file's structure a bit more. Maybe it uses a checksum somewhere for the data you want to edit, or it is just stored elsewhere and you were editing the wrong thing.
Make a save. Make the data to change (in the shortest time possible) and make a new save. Compare these for what have changed.
But also, what is your problem?
Does the value just don't change, or the save becomes corrupted?
Cannot input any value. I tried ImHex and with it I am able to change values now... I don't know why
Oh and one more thing!
Do you obtain this file from the file system, or do you need to extract it from some kind of a container file, and then implant back the modified version?
SnowRunner's asset files cannot be edited unless you unpack and repack them with winrar. Anything else (as far as I tried, windows tools at the time) and it won't work.