Probably it's meant for developing apps that require the Workbench windowing environment and should open windows on the Workbench screen (i.e. they have no screen of their own).
And so even though the editor is in PAL, the split second before execution of your code it pulls the rug out from under by switching to the NTSC mode you use for Workbench. And then VPOS never reaches the last PAL rasterline, throwing off the WaitEOF (which could be rewritten to handle NTSC).
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