Polymer: Observers not called on component inside an iron-list template

[fabysdev]

Description

It seems like property observers are not called if the component is inside an iron-list template.
A dom-repeat renders fine outside of an iron-list but not inside of it.
If I call render on the dom-repeat it renders normally.

Live Demo

http://jsbin.com/pulaworude/edit?html,js,output

Expected Results

dom-repeat renders items

Actual Results

dom-repeat does not render items

Browsers Affected

• [x] Chrome
• [x] Firefox
• [x] Edge

Versions

• Polymer: v2.0.0
• webcomponents: v1.0.0

It works with version 2.0.0-rc.8. First broken version is 2.0.0-rc.9.

[kownacki]

I also have exactly the same problem. Thank you reporting it and finding workaround to use 2.0.0-rc.8.

[sorvell]

Thanks for reporting this. We can confirm this issue. There's a simple fix and it should make the first bug release version.

The issue is in PropertyEffects at _readyClients. If a client has enabled properties prior to an element readying its clients (this can happen when using templatize), the host element should call _flushProperties on it.

[jogibear9988]

see https://github.com/Polymer/polymer/issues/4609