Yes, this 'feature' is still working... happens every morning when performing the various explorer and geologist activities, when lots of system log entries are occurring. Sometimes all 3 stone searches conclude with no entry; other times one or two might make an entry (fail or success does not appear to make a difference either), though all 3 are back and ready to perform. For the record, I only send my wino (Tavern) geologists on stones searches, if that helps.
I have noticed that is appears to only affect 'stones' searches. This might be because of the large amount of activity on the island at the time. As it appears localized to 'stones' searches, I have not pushed the issue, though it probably should be dealt with as it might be affecting other activities as well, but we are not identifying.