I have not experienced this personally. As a possible workaround, could you fast travel to a different region and do a long rest to recover there? I know you said there's a 50% chance of a crash, but 50% is better than 100%. That might get your spells slots back, though you might have to reload a couple of times.
Honestly 50% was probably a bit generous, it happens way more than not even in the other camps. I do try to get to different regions but without spell-slots it's hard to get past some of the mobs that are guarding them. The easiest I would say is the crypt, but only if I pass the skill-checks to persuade the ones guarding it to leave so the fight inside is cut down by half.
Oof, I am having the exact same issue, I was not having any problems until the recent Hotfix; However, the game crashes consistently for me regardless of where my party takes a long rest. 0-0
I hope they have looked at my numerous bug reports and crash logs since this doesn't seem to be happening to many people. I do play with a few mods but they're cosmetic (hair and clothing) so I don't see why they would affect the long-rest system, especially since they had no impact pre-hotfix. They're all compatible with Patch 5.