"Include z-dimension" checkbox doesn't seem to function

[qgib]

Author Name: Jason Ferrier (@jasonferrier)
Original Redmine Issue: 20220
Affected QGIS version: 3.2.3
Redmine category:unknown
Assignee: Nyall Dawson

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With a GeoDatabase file source that contains PointZM Geometries, when I export to a CSV and untick the "Include z-dimension" checkbox, my CSV output still contains Z data.
When I generate another CSV with all the same options/configuration but leave the "Include z-dimension" checkbox checked (default state) and do a diff on these two files, there is no difference.

It seems as though this checkbox doesn't do anything.

[qgib]

Author Name: Jason Ferrier (@jasonferrier)

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This seems to have been occuring back with v2.18 as well as seen in issue #25566

This is also happening to another user. Here are their system details:

*Linux:*
Linux aleph 4.4.0-138-generic #10223-Ubuntu SMP Tue Oct 2 17:16:02 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

*QGIS:*
QGIS version
3.2.3-Bonn
QGIS code revision
9b17680
Compiled against Qt
5.5.1
Running against Qt
5.5.1
Compiled against GDAL/OGR
2.2.2
Running against GDAL/OGR
2.2.2
Compiled against GEOS
3.5.1-CAPI-1.9.1
Running against GEOS
3.5.1-CAPI-1.9.1 r4246
PostgreSQL Client Version
9.5.2
SpatiaLite Version
4.3.0a
QWT Version
6.1.2
QScintilla2 Version
2.9.1
PROJ.4 Version
492

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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• assigned_to_id was configured as Nyall Dawson
• status_id was changed from Open to In Progress

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Applied in changeset 0f22a29.

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• done_ratio was changed from 0 to 100
• status_id was changed from In Progress to Closed