ID 514323 - The Manifest Source knob always displays Sidecar when opening the Cryptomatte node Properties with an active sidecar file.

Problem summary
The Manifest Source knob always displays Sidecar when opening the Cryptomatte node Properties with an active sidecar file.
 
Customer reported version
Nuke 13.1v3
 
Customer reported platform
Linux
 
Steps to reproduce
1) In Nuke, read in an .EXR file with Cryptomatte metadata featuring a sidecar. ex: https://github.com/Psyop/Cryptomatte/tree/master/sample_images/sidecar_manifest 
2) Add a Cryptomatte node, automatically pulling in the sidecar file.
3) Set the Manifest Source knob to Metadata, then close the Properties bin.
4) Double-click the Cryptomatte node and view the Properties bin for Manifest Source.
 

 
 
Expected behavior
The Manifest Source knob should remain on the last chosen value when closing/re-opening the Properties bin.
 
Actual behavior
The Manifest Source dropdown will always display the Sidecar value when it is auto-populated from the Cryptomatte node sidecar reference. This prevents any metadata for the selection from the Source to be utilized.
 
Workaround
Clearing the sidecar file path, closing the Properties bin, then re-opening the Properties bin and re-adding the sidecar file path manually allows the Metadata value to be selected, and persists when closing/re-opening the Properties bin.
 

 
Reproduced by Support in:
Nuke 13.2v2 - Windows 10, CentOS 7
Nuke 13.2v1 - Windows 10
Nuke 13.1v5 - Windows 10
Nuke 13.1v2 - Windows 10, CentOS 7 - regression
 
Unable to reproduce bug in:
Nuke 13.1v1 - Windows 10, CentOS 7
 
Earliest version tested
Nuke 13.1v1 - This issue doesn't appear in this version and has regressed.