If you are talking for 5G B1 measurement impact on 4G, yes there is huge impact.
Even there is some features to limit the times the 4G mobile will attempt to measure the NR in order to reduce the impact of B1 measure on LTE performance.
I was referring to only measurement being processed within GAP period , what sort of impact it can have on user experience . Any studies or reference can someone share please .
Scenario :
Lets say user(5G SA /LTE) on a cell edge hopping on a two cells , both cells serving with good radio conditions and enough capacity.