ID 557084 - Nuke duplicates a channel and slows performance when making changes in a specific script

Problem summary
Nuke duplicates a channel and slows performance when making changes in a specific script.
 
Customer reported version
Nuke 14.0v5
 
Customer reported platform
Windows 10
 
Steps to reproduce
1) Download the attached Nuke script and EXR sequence.
2) Launch Nuke and open the downloaded script, observing the available channels in the status bar.
3) Adjust the File knob for the Read node to view the downloaded EXR.
4) Observe the available channels in the status bar.
5) Make any changes to any nodes or knobs in the script, observing available channels and performance.
 
Expected behaviour
The channels should remain the same in the script unless adding more manually.
 
Actual behaviour
The alpha channel becomes duplicated exponentially when making changes throughout the script.
 
Workaround
There is no available workaround at this time.
 
Reproduced by Support in:
Nuke 14.1v1 - Windows 10, CentOS 7
Nuke 14.0v1 - Windows 10
Nuke 13.0v1 - Windows 10
Nuke 12.0v1 - Windows 10
Nuke 11.0v1 - Windows 10
Nuke 10.0v1 - Windows 10
Nuke   9.0v1 - Windows 10, CentOS 7
 
Earliest version tested
Nuke 9.0v1 - This issue appears to be in all tested versions of the product