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Nothing wrong with the install ;)
There are a bunch of different theories as to why and when this can happen. In the past I’ve hammered ultra torque bearings through flooded lanes where they’ve been submerged for some pretty long stretches of road (I’m not exaggerating) and they’ve still not creaked. Any bearings I’ve had that have creaked I’ve often found were silenced by some deftly deployed dry lube dripped between the crank arm and the cup.
I suppose youve done the usual things like applying good grease to the right surfaces. Where in the stroke is the creak happening? Are you using press fit or threaded bb? Is the wavy washer on correctly?