Iris Air lock shows 7 hPa on the other side and 1013 hPa on this side (corridor to large dome); so the corridor tries to depressurize. So far so fine. If approached from the other side (dome to corridor), the low-pressure side now claims to be at 1013 hPa, while the former high-pressure side now reports at 7 hPa and the dome tries to depressurize. The pressure in the base never equilibrates.
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