I am having the same issue in 10.5 building imagery cache and was wondering if you were ever able to figure this out. The last time I updated our imagery caches it was done in 10.2.1 and did not have any issues. It caches fine for the scales 1:4,622,324 down to 1:18,055 but starting with 1:9,027 down to 1:2,256 it starts to leave gaps and does not give an error at all.
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