[Bug 1846423]

[1-geoff]

Created attachment 9227653
1560151-trigger-duration.diff

I sure would. I hate this error message too, but I've never had the time
to figure it out.

FWIW, `X-` properties are [allowed in the
specification](https://datatracker.ietf.org/doc/html/rfc5545#section-3.8.8.2)
and should be ignored by implementations that don't understand them.

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https://bugs.launchpad.net/bugs/1846423

Title:
  Lightning: Cannot dismiss reminders. Got a VALUE parameter with an
  illegal type for property: VALUE=DURATION

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