Try this. Edit the NpEditThisButton snippet.
Around line 140, find this code:
if (in_array($resourceToEdit, $hidden)) {
$defaultButtonCaption = 'In noShow list';
}
And change it to this (add a comma and true after $hidden):
if (in_array($resourceToEdit, $hidden, true)) {
$defaultButtonCaption = 'In noShow list';
}
Clear the cache and see if that helps.
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