How did a major project breaking bug end up in 2021 LTS?

Unity Engine
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What went wrong that allowed a major project breaking bug to make it into 2021 LTS?

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Hello andymads,
First of all, we want to apologize for introducing this regression. We understand that it affected a lot of our users. While these type of regressions are uncommon, sometimes it happens. To answer your question, this was caused by a missed backport (the fix was composed of two parts). We learned from it and adjusted our processes against LTS backports so it doesn’t happen again.

1 Like
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Ouch!

We learned from it and adjusted our processes against LTS backports so it doesn’t happen again.

Great to hear.
I wondered whether somone is already using UIToolkit in production, now I know XD!

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Not that this situation couldn’t happen for UI Toolkit, but this specific issue was for UGUI.
The whole team learned from that incident though.

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Double ouch!!
I didn’t expected this to be a uGUI issue.

I read “UI Elements” in the issue and was thinking about UIToolkit because it was called UIElements in early versions.