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Fixed in 2020.3.X



Found in



Issue ID




Crash when quickly duplicating prefab with Behaviour Brick attached and undoing duplicate in LEGO Microgame



How to reproduce:
1. Open user attached project ""
2. Go into Assets -> LEGO -> Scenes
3. Open the "Microgame - Cannonball Bingo" scene
4. Go into Assets -> LEGO -> Prefabs -> Lego Behaviour Bricks
5. Drag and drop the green "Counter" brick into the scene
6. Drag the yellow "Touch Trigger" brick and connect it on top of the green "Counter" brick
7. Select the two connected bricks and duplicate them with "CTRL + D " ~ 10-15 times
8. Quickly press "CTRL + Z" to undo

Expected result: No crash, no freeze
Actual result: Freeze then crash

Reproducible with: 2020.3.18f1,
Not reproducible: 2019.4.30f1
Couldn't test: 2021.1, 2021.2, 2022.1 (Lego microgame template not available)

* If the crash is not reproducing, repeat only step 7 and 8 but faster
* Before the crash, Unity freezes for a few seconds

  1. Resolution Note (fix version 2020.3):

    Fixed in: LEGO® Microgame v2.4.2

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