[mikelangmayr]

• is_producer_finished, is_producer_error and is_consumer_error had no initialiser, so a freshly constructed exposure mode started with indeterminate values.
• They are read before a session sets them, by the reap at the start of the next one, so the indeterminate value surfaced as a failure that never happened: an abort that worked reported "abort failed".
• Observed on the HISPEC tracking camera as an intermittent abort failure, present on roughly half of freerun runs and on every run of the autofetch and freerun combination. With the initialisers the false reports stop.

[scizen9]

Looks good!