I lived in France for 9 years and worked extensively with non-native speakers in English. My accent and word choice definitely shifted to a more international,

I lived in France for 9 years and worked extensively with non-native speakers in English. My accent and word choice definitely shifted to a more international, neutral English at work. However if I started chatting 1:1 with a native speaker at lunch my speed and word choice would immediately shift and the other coworkers couldn't follow a damn thing.