There is no reason for this not to work in the attached snippet. I just tried it myself and it worked as expected. You can find attached my test page and a short video from my experiment as a reference.
At this point I can advise the following:
- compare your actual setup with mine to find the difference that causes the problem
- if neither helps, post the modifications to my page needed to observe the issue with this page, so I can actually investigate it.
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