Since Optimus Prime destroyed the Transwarp key in Transformers: Rise of the Beasts' ending, Transformers 8 can introduce 5 new devices to reinstate time travel in the live-action franchise. In its 2-hour runtime, Transformers: Rise of the Beasts dropped several references to the original Transformers lore. While some of these references and easter eggs were direct nods to the ingenious designs of the Generation 1 Autobots, others were subtle connective threads to the story developments of the previous movies. In all of its callbacks to the original Transformers lore, Transformers: Rise of the Beasts introduces the Transwarp key.

https://screenrant.com/transformers-8-time-travel-replace-transwarp-key/