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Fixed in 2018.3.X

Fixed in 2019.1.X



Found in




Issue ID




Canvas Group Alpha does not affect nested Canvas UI elements when used in parent Canvas



How to reproduce:
1. Download, extract and open attached project (
2. Open 'SampleScene'
3. Modify Canvas Group Alpha in the 'Parent canvas' Canvas to see the issue

Expected result: Both buttons are affected by the Canvas Group
Actual result: The button that is the child of the nested Canvas is not affected unless the Alpha is 0

Reproducible with: 2018.3.0f2, 2019.1.0a13
Not reproducible with: 2017.4.18f1

Fixed in: 2018.3.8f1, 2019.1.0b3, 2019.2.0a5

Comments (5)

  1. bagelcode

    Feb 22, 2019 08:29

    It is a very very serious issue, Unity! Also, Unity 2019.1 is in the beta stage, so it can't be say fixed. If this is not fixed into 2018.3.X, it's going to be a problem for so many projects.

    Our projects have a lot of contents, and on live. And we upgrade Unity 2018.3.0f2 from LTS for wasm boost one month ago. So we'll decide revert to LTS(it maybe a very hard way) or fix it using dirty ways. Please, answer anythings.

  2. Mahgo

    Feb 14, 2019 07:15

    This is causing me issues too. Any update on backporting this?

  3. The-Real-Zap

    Feb 07, 2019 01:56

    This totally messes up my UI hierarchy and logic. I added nested canvases to improve performance following your guidelines, only to enter another world of problems. Now I have to rewrite my UI handling scripts and they will turn into a mess. This MUST be backported ASAP, I'm using 2018.3.4 and it breaks. Please make me happy and backport it in 2018.3.5 (2019.2, WTF???)

  4. Spacew00t

    Feb 06, 2019 21:35

    I see this is fixed in 2019.2, is this going to be back ported into 2018.3.5? Or is there not going to be a 2018.3.5, and the next actual release will be 2019.2? I'm still not clear how the new versioning works. All know is that this bug is buggin' me!

  5. Spacew00t

    Jan 25, 2019 16:12

    Any idea what version this is fixed for?

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