ID 479326 - Revert command changes simulation start position for recently saved scene.

Problem summary
Revert command changes simulation start position for recently saved scene.

Customer reported version
modo.15.0v3

Customer reported platform
windows10

Steps to reproduce

1) Launch Modo and load customer provided scene.

2) Select edge selection tool and choose the first three edges at top of spiral.

3) Go Setup Layout and choose Select by Index (2) node.

4) In Properties click on Set.

5) Start point for simulation should now be set to selected edges.

6) Go to File > Save.

7) Go to File > Revert.

8) Observer that the replicator simulation start point changes to random location despite no changes occurring to the scene.

Expected behaviour
Clicking Revert should cause nothing to happen given no changes to the scene have occurred since the save.

Actual behaviour
Revert gives notification box that no changes have occurred since last save, but once clicking on OK the start point changes to random location.

Workaround
Unknown. 

Reproduced by support
This bug has been reproduced in:
Modo 15.0v3 - Mac OS X
Modo 15.0v1 - Mac OS X - Regression

Unable to reproduce bug in:
Modo 14.2v1 - Mac OS X

Earliest version tested
Guidance: List earliest version you've tested and the reason you stopped there. Reasons can be:
Modo 14.2v1 - Mac OS X - This issue doesn't appear in this version and has regressed

As a note for builds preceding Modo 15.0v1 there are initial errors when loading the scene, but the reported problem does not appear.
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