ID 510224 - Multi-Input OpScript nodes disappear from Macros

Problem summary
Imported Macros cannot load Multi-Input OpScript nodes correctly. 
 
Customer reported version
katana.4.5v3
 
Customer reported platform
centos7
 
Steps to reproduce
   
2) In the OpScript's parameters, enable the "Display as multi-input" option.
 
3) Select the Group node by double-clicking it, then click the wrench icon in the top right of the Parameters tab and select "Save as Macro...".
 
4) Save the Macro to ".katana/Macros/_User" located in your home directory.
 
5) In the NodeGraph, import your saved Macro using the Tab context menu.
 
Expected behaviour
The imported Macro should be the same as when it was saved.
 
Actual behaviour
The Multi-Input OpScript node has disappeared from the Macro instance.
 

 
Workaround
Unknown.
 
Reproduced by support
This bug has been reproduced in:
Katana 5.0v2 - Windows 10
Katana 4.5v2 - Windows 10
Katana 4.0v7 - Windows 10
 
Unable to reproduce bug in:
Katana 5.0v1 - Windows 10
Katana 4.5v1 - Windows 10
Katana 4.0v6 - Windows 10
 
Earliest version tested
5.0v1, 4.5v1, 4.0v6 - This issue doesn't appear in these versions and has regressed