Thank you for bringing this one up. This is not a bug, surprisingly, but rather a feature of Millus and Deome's LibGuildHistory. DataDaedra uses LibGuildHistory to request all available sales history from the servers without triggering ZO's spamkicker ("You have been kicked for spamming messages"); the library queues and processes history requests from any and all addons that use the library.
The Guild History tab will be restored once LibGuildHistory finishes the queue; it is temporarily hidden so that the player does not inadvertently trigger any history requests while LibGuildHistory is also requesting history -- were that to happen, the player might be kicked for spamming messages (history requests).
Once DataDaedra or ddShopkeeper finish their requests, it'll be there, I assure you. Future versions of both addons will make scanning on login/zoning optional, so that if you're moving to alts/mules and just need a quick history check, it will not be automatically delayed by LibGuildHistory.
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