Finding the culprit: why do you think the culprit is the HPE OfficeConnect 1920S switch? just because it provides you the evidence that something is not working as you expect (HiSpeed->LowSpeed transition on one port)? isn't possible that the issue you're experiencing is related to the unmanaged switch instead? can you try to exclude it from the equation? are there other illuminating logs (related/unrelated to port 48) HPE OfficeConnect 1920S switch side?
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