Sounds like a spot of overboost in the higher gears.
Mapping is often done with 3rd gear pulls, especially if done on a dyno.
When on the road you can generate boost spike or longer sustained higher boost in 4th/5th that can cause fuel cut or boost oscillation, dependant on where the boost/fuel cut threshold is set.
Could be worth looking at the tune to see what it's actually mapped to achieve vs what it's achieving and where the limits are set.
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