AE Keyboard Editor Bug ? 15.1.2 (2018)

Version 15.1.2 (2018)

Hi there, I am having a frustrating issue, moving from AE 2014 to 2018. I am manually setting up shortcuts as I like them in the new editor.
The issue is for some commands, if I remove the short cut, the command disappears after I save the keys. So if I assign "Take snapshot 1" to nothing and save the keys and reopen editor, that command disappears!

Even when I go into the text file, I can see that the line has been removed! Furthermore I can see that
AppData\Roaming\Adobe\After Effects\15.1\aeks\After Effects Default.txt = 27.5kb
AppData\Roaming\Adobe\After Effects\15.1\aeks\AlanEddieKeys2.txt = 21kb

So as I unassign a command it is actually deleting the line from the keyboard shortcut file, which disables the command from appearing in the shortcut editor!
Am I missing something obvious or was this a known bug?

Thanks for any pointers.
A

Alan Eddie
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3d Animation + VFX + After Effects Scripting
alaneddie.com
aescripts.com/authors/a-b/alan-eddie/