Hmmm, I had a similar experience yesterday when using my equipment after weeks of bad weather.
In my case it is <1s when capture fails. Cameras are ASI 294mc (main) and ASI 224mc (guiding). Both cameras fail at <1s.
System is an RP4 running Astroberry and updated yesterday as well. Astroberry only has the "stable" branch available. So no updates for INDI and KStars since a while.

However, I remember that short exposures have worked before, but I cannot recall how long ago that was.

CS
Guido

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