ID 484567 - Adding a new entry to the Path Substitutions table will sometimes add two new rows

Problem summary
Adding a new entry to the Path Substitutions table will sometimes add two new rows

Customer reported version
N/A

Customer reported platform
CentOS 7

Steps to reproduce


1) Open Nuke in safe mode. This is just to ensure that the Path Substitutions table has no entries.

2) Navigate to Edit > Preferences > General

3) Single click the + (plus) button under the Path Substitutions table:

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4) If the issue does not occur at first, press the - (minus) button to delete the current row and press the + (plus) button again. Repeat this until the issue occurs.
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Expected behaviour
Pressing the + button, to add a new entry to the Path Substitutions table, should only ever add a single new row.

Actual behaviour
Pressing the + button, to add a new entry to the Path Substitutions table, sometimes adds two new row.

Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:
Nuke 13.0v3 - Windows 10 - macOS 10.15 (Catalina) - Linux CentOS 7
Nuke 12.0v1 - Windows 10