In Star Trek II: The Wrath of Khan (1982) the opening scene has the Enterprise attacked by Klingon warships.
COMPUTER VOICE: Alert! Sensors indicate three Klingon Cruisers, bearing three one six, mark four, closing fast.
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There is ne explanation in the movie how the Kingon ships go so fast from being detected to being withing firing range. Possibly the Klingon ships could have used cloaking devices to get within range and then decloaked right before firing.
On the other hand, nobody mentions anything about the Klingon ships using cloaks during the scene.
The whole scene happens implausibly rapidly. Thus it is possible that Saavik was psychologically conditioned to accept the test as reality, despite the implausible aspects of it, the conditioning ending when Kirk halted the test.
Thus it is possible, but uncertain, that the Klingon ships are supposed to use cloaking devices in this scene.