Attribute bindings inside amp-render doesn't work

### Description

Binded attributes inside amp-render template don't reflect state changes. Even if amp-render has *binding="always"* option binded attributes show only initialization state and don't show actual state.

In example below binded attibute *[text]* outside amp-render reflects state changes, but *[text]* inside component still show initialization state.

### Reproduction Steps

https://share.gemozlob.in/amp-render-bug.html

Click on "set foo" / "set bar" button

### Relevant Logs

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### Browser(s) Affected

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### OS(s) Affected

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### Device(s) Affected

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### AMP Version Affected

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