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Fixed in 2021.3.9f1



Found in


Issue ID




UI Elements are no longer rendered when deactivating and reactivating the Parent GameObject



How to reproduce:
1. Open the attached project “CanvasBug”
2. Open the “SampleScene” Scene
3. Deactivate and reactivate “Canvas” GameObject
4. Observe the Scene View

Expected result: The UI Elements are rendered
Actual result: The UI Elements are not rendered

Reproduced with: 2021.3.6f1
Not reproduced with: 2020.3.36f1, 2021.3.5f1, 2022.1.9f1, 2022.2.0b1, 2023.1.0a3

Reproduced on: Windows 11 Pro, macOS Monterey 12.4 (M1)

  1. Resolution Note (fix version 2021.3.9f1):

    uGUI: When disabling a canvas and reenabling it, Canvas now renders correctly.

Comments (38)

  1. Enrique48k

    Sep 02, 2022 23:25

    I confirm that it is resolved in 2021.3.9

  2. vcmiller

    Sep 01, 2022 19:31

    Was getting this in 2021.3.8, it does indeed seem to be resolved in 2021.3.9.

  3. longshotgames

    Aug 28, 2022 03:02

    This is definitely NOT fixed!

  4. castor76

    Aug 24, 2022 10:06

    Just spent 3 hours making video and uploading my entire project for bug reporting twice, because of this bug. And I didn't know it was already being addressed. It is hard to find such duplicate case in the jungle of issuetracker so if something like this major critical bug exist, it should be pinned at the top of the relevant forum site on Unity ( UGUI&TextMeshPro) So......... Frustrating!

  5. derkoi

    Aug 24, 2022 06:37

    Come on Unity! This is a shit show!

  6. longshotgames

    Aug 24, 2022 05:56

    FICK YOU unity! Fix this NOW!

  7. lanpartygamesstudio

    Aug 23, 2022 10:49

    Absolutely unacceptable that a bug this critical and obvious has made it into a LTS build.

    Makes you wonder about how Unity's internal development processess work...

  8. mster50-2

    Aug 22, 2022 13:39

    The sheer amount of time I spent trying to figure out what was going on makes me pretty grumpy that this regression was introduced in an LTS build.

    After figuring out it wasn't my event system at all and isolating the issue, I finally was able to find a bug report on this problem. Given the prevalent usage of sub-canvases and the fact it's recommended as a performance-gaining measure, it's pretty ridiculous this bug saw a release build.

    So many hours wasted. Not pleased.

  9. Devil_Inside

    Aug 17, 2022 13:25

    Ridiculous irresponsibility to introduce bugs like this one into an LTS build. I have no words.

  10. Radiogaga84

    Aug 15, 2022 14:23

    ... This is very urgent issue..
    It breaks whole UI System in my project...!


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