What's the issue?

amp-imgs within amp-sidebar toolbars get duplicate i-amphtml-sizer elements

How do we reproduce the issue?

I've set up a POC on jsbin, you can make this happen on your own by doing the following:

1. Create a amp-sidebar element with an included nav toolbar that targets an element in the page
2. Add an amp-img underneath that toolbar
3. View the rendered amp-img

You'll notice that there are two i-amphtml-sizers being added, causing the amp-img to be double the intended height

What browsers are affected?

Confirmed in:

• Chrome
• Firefox
• Safari
• Edge 16
• IE 11
• Chrome for Android

Which AMP version is affected?

Tested on 1521658019509