I found this in a fully updated 3.1a image, but don't know when it was
introduced:

Steps to reproduce:

1. Drag a holder out of the "Supplies" bin
2. Open a viewer for the holder
3. Create a new script (by dragging out the "emptyScript" tile)
4. Change the name of the script to anything
5. Hit return, and get a walkback:

MessageNotUnderstood: cards

VM: Mac OS - Squeak3.1alpha of 16 May 2001 [latest update: #4081]
Image: Squeak3.1beta [latest update: #4411]

UndefinedObject(Object)>>doesNotUnderstand:
CardPlayer42(CardPlayer)>>renameScript:newSelector:
ScriptEditorMorph>>setScriptNameTo:
UpdatingStringMorph>>informTarget
UpdatingStringMorph>>acceptContents
StringMorphEditor>>keyStroke:
StringMorphEditor(TextMorph)>>handleKeystroke:
KeyboardEvent>>sentTo:

-Eric