Dunno.

However, I did just notice that with the version I'm playing with now (no significant difference in the related parts, though), I only see the battery icon and delay when the engine is off.

In/out of standby with the engine running is just fine, thank-you.

So, I'm dropping the investigation.

On the off-chance that my slight tweaks since v288 may have fixed something, I'll leave them in for v289 (5-10 minutes from now).

Cheers