AMP feature of the STAMP - bookend doesn't work on 2105210438003

[Ichigo3d]

Description

Bookend should appear after tapping on the last slide, but on 2105210438003 it doesn't appear. Production version 2105150310000 is not affected.

Reproduction Steps

1. Go to https://www.google.com/search/static/gs/animal/m096mb.html or https://www.gstatic.com/amphtml/stamp/qa/bookend.html
2. go to the last slide
3. tap again

Actual result: After tapping on the last slide, bookend doesn't appear.

Expected result: After tapping on the last slide, bookend should appear.

Relevant Logs

No response

Browser(s) Affected

Chrome, Firefox, Safari

OS(s) Affected

No response

Device(s) Affected

No response

AMP Version Affected

2105210438003

[newmuis]

This is expected, add the bookend has been removed.