IIRC, one theory was that the reason it left no crater is because it impacted a glacial ice sheet.
One the glacier melted, any crater would have melted with it.
Doubt it. A 4k meteor would hardly be even slowed by a 2 to 3 mile thick ice sheet.
It would release energy of 3.47 x 10 to the 6th megatons of TNT. The largest H-bomb ever built was 57 megatons.
Ice isn’t going to do much to affect that.
Here’s a neat impact calculator.
http://impact.ese.ic.ac.uk/ImpactEffects/