Interaction with some items require you to be in human form, some don't. There is no logic, reasoning or pattern behind it.
Please streamline this! Either all item interaction/pickup requires you to be in human form or none - just not let it be a gamble every time.
Actually i wouldn't mind if all requires human form but if so, then auto switch us to the correct form on click of the item/npc. Same goes for stablemasters, riding, etc.