ID 575536 - Markers from the previous Sequence Revision can appear after a SBP Import

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Problem summary:
Markers from the previous Sequence Revision can appear after a SBP Import
 
Customer reported version:
Flix 6.6.2
 
Customer reported platform:
macOS 13
 
Steps to reproduce:
1) Open the Flix client, and make sure the Markers Preference is enabled in Preferences > Panel Browser > Markers
2) Create a new Sequence Revision with one or more Panels and a Marker:

3) Import a SBP project into the same Sequence in Flix, such as the attached simple_project.sbpz file.
4) Open the newly created Sequence Revision, and observe how the Marker from Panel 2 in Sequence Revision 1 is now attached to Panel 1 in Sequence Revision 2:

 
Expected behavior:
Markers from previous Sequence Revisions should not appear when importing SBP projects.
 
Actual behavior:
After importing a SBP project, Markers from the previous Sequence Revision can be added.
 
Workaround:
Before importing a SBP project, create a Clean Revision that only contains a blank panel without any Markers. This seems to prevent the SBP import from utilizing previous Markers. 
 
Reproduced by Support in:
Flix Client 7.0.1 - Windows 10 | Storyboard Pro 22 | Flix Server 7.0.1 - CentOS 7
Flix Client 6.6.2 - Windows 10 | Storyboard Pro 22 | Flix Server 6.6.2 - CentOS 7
Flix Client 6.6.0 - Windows 10 | Storyboard Pro 22 | Flix Server 6.6.0 - CentOS 7
 
Unable to reproduce in:
Flix Client 6.5.1 - Windows 10 | Storyboard Pro 20 | Flix Server 6.5.1 - CentOS 7
 
Earliest version tested:
Flix 6.5.1 - This issue does not appear in this version and seems to only occur with Storyboard Pro 22

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