The closed circuit 1/4” output jack will effectively short out the secondary of the output transformer if nothing is plugged into it (if wired as shown).
Unless the schematic is "properly" drawn out to show what the designer's actual intent is, you can only -- surmise -- what the current schematic is actually showing. DaveP will either need to update his schematic to electrically show what his intent really is or, he will just need to offer an explanation of what his current schematic is actually conveying. But.....I also get your point as well!!!I think that is a stereo jack (tip and sleeve--ring not shown) and not a switched mono jack.
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