It is my suspicion perhaps this is a system-wide anomaly causing occasional, random, asynchronous erroneous events.
There are a number of reports of this behavior and I’ve been following several of those threads.
My own experience is a remote, sleepy contact switch on a door that has not been opened that suddenly reported ‘open’ – and was later physically checked and found closed.
After the DTH was modified to fetch the contact state when the sleeping device woke to tell its battery state, it reported the door ‘closed,’ as expected.