Hibernating Zorin 1.15.3 does not restore what was open

I’ve tried to enable hibernation on Zorin OS and it seems to work, but it fails to restore what was open. I have a swap file, not partition, that used to have 2 gigabytes allocated but now has 16 according to the system monitor, same as my RAM. I’ve set the restore partition to be the Zorin partition and even tried setting it to the extended partition, that contains one single partition (Zorin) but it still fails to restore what was open.
I haven’t tried this guide because I don’t know what to put as UUID - the output from the command is simply /swapfile none swap sw 0 0 .
What should I do?