Most likely it is during taxi, that this event is occurring.
My airlines Ops specs specifically say that this is a "no-no" during normal taxiing, fearing Fod ingestion.
It also is common that a TR
'd out due to a maintenance issue.
Under normal landing operations, TR
reduction is started at 80kts then should be stowed at no less than 50kts, to reduce the chances of Fodding an engine.
Again this is the OPS procedures at my airline.