Perhaps you should consider checking your saddlebag. Currently, the Search function doesn't seem to pick up saddlebag and only does Inventory. Though...everything defaults to Inventory Space as soon as it drops.

I don't think this was a bug, considering the state of it. If this was definitely a big bug, they would've squashed it on the spot since Savage is difficult. Since you said you had 10 slots, could you post an image regarding your inventory at the time if you have it?