Vanilla hearthstone needs to be in bag to create docket. if not in bag, does not create docket despite othres being available. some alternatives have been made into toys, saving a space as don't take up bag slots.
below is another related issue that popped up, adding additional hearthstones to the button. some were included

failcoder/SVUI-Temp#66

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http://www.wowhead.com/item=64488/the-innkeepers-daughter

Now a toy so not actively in the bag. acts as an alternative hearthstone.
Is it possible to add detection for this toy and if so use on the hearthstone dock in the bottom left?

other such toys that share cooldown/ability with hearthstone
http://www.wowhead.com/item=93672/dark-portal
http://www.wowhead.com/item=54452/ethereal-portal

This should be fixed. Please test and let me know if you still have this happening.

Should have confirmed earlier. Docket does indeed appear without the vanilla hearthstone in bags.

However the functionality to use the toys would be appreciated. This could be a scan once and list thing. The toys are not restricted from use beyond just owning them, so once scanned should be able to list them.

will poke at it with what little I know of lua and WoW and see what I can make happen. promises of a novice.

The part of the api to call toy use mentions being protected so it may not be accessible at this time.
http://wowprogramming.com/docs/api/UseToy

another possibly relevent page reg. toys. https://github.com/tomrus88/BlizzardInterfaceCode/blob/master/Interface/AddOns/Blizzard_Collections/Blizzard_ToyBox.lua

again, not sure if helps or not