2.0 TDI BKD turbo hissing on 6th -> 5th gear

Rideen

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Hey all,

A few days ago I noticed that my turbo (or something else) is causing very loud hissing noise when going from 6th gear to 5th gear.

I usually switch back to 5th gear at around 80-90 km/h and this only happens when I switch from 6th to 5th gear, it is barely noticable when lowering to other gears (5-4, 4-3, 3-2, etc).

Is this a sign of turbo failing or is it normal? Again, I repeat, it almost doesn't happen on any other gear change.