Edit section button does not appear if section title is generated by Velocity

Create a test page with the following wiki code:

—

1 This is a title

This is the first section content

#set ($title="This is another title")
1 $title

This is the second section content, see how the edit section button is missing

1 this is the last section's title

This is the last section, see the edit section button
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You'll see that second section do not have a "edit section" button.