Getaway Glamer Wipes Attack History of Rampaging Ursaguana
Happens in either case:
Attack with Rampaging Ursaguana while it is face down.
When it becomes blocked, cast Getaway Glamer with Spree Option #1 targeting the Ursaguana. Ursaguana returns to the battlefield without any bonuses for the attack.Attack with Rampaging Ursaguana while it is face up.
Rampaging Ursaguana gets the bonus.
Cast Getaway Glamer on the Ursaguana with Spree Option #1.
The Ursaguana returns to the battlefield without the bonus.
I just recalled that Tawnos Endures, at least when Rampaging Ursaguana is exiting face-down status, does the same thing.

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routergnome#42116 commented
The rules aren't quite applying that way based on the interaction with Reflection Net.
1. Reflection Net exiles Rampaging Ursaguana
2. Reflection Net applies itself to a creature
3. Creature is a copy of the card that was exiled, retaining its attack history
4. Reflection Net is destroyed, and Rampaging Ursaguana returns to play.
5. Rampaging Ursaguana's attack history has been wiped.Edit - it's possible that this scenario is a separate bug where, despite the target being affected "becoming a copy of a card exiled by Reflection Net", it actually is retaining the target's attack history, despite it supposedly becoming a copy of the card from exile, which supposedly has lost its attack history upon entering exile.
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Rezzahan#77802 commented
When a creature leaves the battlefield and returns, it is a new creature as far as the game is concerned. That new Ursaguana has not attacked this game yet.
400.7. An object that moves from one zone to another becomes a new object with no memory of, or
relation to, its previous existence. This rule has the following exceptions.
[...]None of the exceptions apply here.