renum failing to recognise extended action 1 format?

[PikkaBird]

I assume no-one has ever tried using the extended action 1 format before? I certainly hadn't.

Renum (a fresh copy downloaded from here) produces these errors around an extended action 1:

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//!!Warning (41): All action 1s are 4 or 6 bytes long.
//!!Warning (89): Action 1 declaring no sets.
//!!Warning (118): Sprite set contains more sprites than given feature can use.
 1042 * 6	 01 01 00 \b16 \b16 08
//!!Error (51): Unexpected real sprite found.

It then produces lots of lovely Error 56s around the action 2s:

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//!!Error (56): Offset 5: Sprite set 00 does not appear in the preceding Action 1 (sprite 1042).

The actual encoded grf behaves as intended.

I can quiet this behaviour by disabling errors 41, 51 and 56 and warnings 97, 89 and 118... but it rather defeats the purpose of renum if I turn everything off.