Changing chapter name in XML breaks preview button in Studio

Description

Steps to Reproduce

1. Go to unit (this an MITx test course): https://studio.edge.edx.org/container/block-v1:MITx+S101+2015_T1+type@vertical+block@e9ec465f8bc949ae930ad5d8047e6e81
2. Press Preview

Expected behavior: would see content
Actual Behavior: page not found

See orphans: https://studio.edge.edx.org/orphan/course-v1:MITx+S101+2015_T1

To create in a fresh course:

1.) Export course
2.) Change chapter file name ex. (0c1ec994774145e1a11d82d108e68203.xml to changed.xml)
3.) Change course.xml reference ex. (url_name="0c1ec994774145e1a11d82d108e68203" to url_name="changed")
4.) Import course
5.) Go to Studio and click on preview

LMS is fine, and you can navigate to the unit on preview.edx.org.

Sandbox: http://studio-jumpto.sandbox.edx.org

Current Behavior

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Expected Behavior

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Reason for Variance

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Release Notes

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User Impact Summary

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Assignee

Awais Jibran

Reporter

Shelby Quinn

Reach

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Impact

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Platform Area

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Customer

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Partner Manager

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URL

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Contributor Name

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Groups with Read-Only Access

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Actual Points

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Category of Work

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Platform Map Area (Levels 1 & 2)

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Platform Map Area (Levels 3 & 4)

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Priority

CAT-2
Configure