Story listings: Analytics on pagination are not matching Prod

[laflannery]

Description

On Prod, when I activate the "Next" button in the pagination component, there is an analytics event for scrollDepth:

This is not present on next-build however:

Tasks

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1. The problem as described is fixed
2. The repro steps result in 'expected result'
3. An automated test is written to catch the problem, if appropriate

How can we see the problem? (repro steps)

1. Please include a set of steps that allows an independent tester to see the problem.
2. Write them so that after the defect is fixed, the steps will result in the expected result.
3. It is helpful to write the steps methodically so they can be the foundation of an automated test.

Expected result: What should be the outcome?

Actual result: What currently happens?

Is there any additional information?

Screenshots:

Log messages (please specify from where or what commands(s))

Log messages here

Why is the problem happening and how do we fix it?