That missing support is what’s probably all up in the sock and on the extruder I bet. If the slicer said it was going to print that support, it would have extruded the filament but without a surface for it to stick to it probably made all sorts of fun spaghetti stuff until it somehow got turned up into the sock by some other part of the print.
About storing filament in bags and any container with desiccant - it’s a two way street. If the desiccant is known to be drier than the filament, that’s great and it will scavenge moisture that gets into the bag. If the desiccant is wetter than the filament, the filament will grab water from the desiccant. That’s qualified. Some desiccants do chemical reactions that lock the water in place and won’t do that. Water just sticks to the surface of other desiccants like silica gel and can easily come or go depending on conditions.
Plastic bags can have another issue in that the plastic is thin and some are a bit transparent to small molecules like water. Some bags have special layers to seal against water but it’s important to know if the bags you are using for storage are water impermeable or not. Depends on thickness, material, and in some cases if those additional layers are there.
If you get some inexpensive hygrometers and put them in the bags with the filament and desiccant you’ll see what’s actually happening in your case pretty quick.