Cannot resize dom0 pool, filesystem keeps corrupting, HELP ME

Long story short I need to copy a load of files into my dom0 pool but I can’t because the mf is locked at 20GB. I tried expanding it with lvresize and resize2fs (to 100 gigs) but whenever I try to copy my files, it spits out errors and then my whole filesystem gets corrupted beyond repair along with my entire Qubes installation. WHY WHY WHY WHY?!?!?!

cp: error deallocating 'file': Input/output error
Here’s what I get:

Edit: forgot to mention that the files I’m copying is the /var/lib/qubes from another Qubes installation, so it’s all “sparse” files. Still they should fit (66gb inside 100gb)