Why is restic not creating imcomplete snapshot when running out of space?

I’m currently using restic to backup my laptop every day on my NAS.
If my NAS is running out of space no snapshot will be created even if 80% of the modified files have been transferred.
Why this decision? and is there any way to create “incomplete snapshot” so they can get access if my laptop dies and I didn’t notice the NAS was full?

To make a snapshot accessible restic would have to upload additional data, which cannot work if the storage is full (at least not reliably).

You could try whether recover is able to reconstruct a new snapshot based on the parts that have been uploaded so far, but to do that it needs a bit of additional space. It’s probably also a good idea to run rebuild-index before to allow recover to check for data in the packs that were uploaded just before running out of space.