well from my experience. if you get shot while transporting the crates even with smallest calibers a 9mm pistol the creates gets buggy. otherwise the unloading works great. also if you save / load a lot while the crates are loaded you are toast.

As I said ... from my experience.

I don't know if it would help, but you might also consider not getting out of the vehicle to unload the boxes. Unload, and if they look like they are going to malfunction, drive off quick-like.

Sounds strange. Could be something changed in game physics. Will look into the bug. As earlier issue certain crates have now massive offset, that is quite annoying to work with.

The only time I've ever seen odd behavior unloading crates has been when I try to unload when the vehicle is parked with very little space around it for the crates to move to. The other day I even picked up a FIAA cache by mistake that had spawned near the crates for the mission with a Construction Truck HEMTT. It loaded with all the mission crates and appeared right behind the rear axles with the camo netting clipping through the sides of the vehicle. All crates unloaded without issue after moving with a convoy escort to the mission objective.

I can confirm I also have some funky unloading/loading behaviour. I picked up some crates (that get dropped once your 4 tents are set up); once getting back to the base, often when unloading the crate would "drop" on top of the vehicle rather than getting placed on the ground.

Simply loading the crate back up then trying again would eventually result in the crate being placed on the ground correctly - rinse and repeat.

In the event of an explosion caused by the buggy crates I would just load the last save (saved once I was ready to unload).