background + backgroundColor in style binding conflict

[MissedWarrior]

Version

3.0.0-rc.5

Reproduction links

https://jsfiddle.net/sy6qt3ce/

Steps to reproduce

In provided pens click on "Toggle" button several times

What is expected?

Background Color to toggle between blue and red

What is actually happening?

Background color is removed after 2 toggles

[posva]

The vue version in codepen is really outdated. The version you provided seems to work well: https://jsfiddle.net/z5239asg/ But I found a different problem with https://jsfiddle.net/sy6qt3ce/ Removing the watcher shows a different behavior as well. I'm updating the issue to reflect the problem, which made me realize a similar problem exists in Vue 2...

[posva]

Ah, never mind, I found the original problem: vuejs/vue#7756, it's a wont fix. Using backgroundColor in the provided jsfiddle works