I run with my Forerunner 255 set to lap every km. It gives me my lap time and lap pace. What is very common is for example it will say lap 12 time 5:08, lap pace 5:09.
If I look at the data, I am assuming that this is because for example my time will be 5:08.8 (which will be trimmed to 5:08 when read out) and my pace is rounded up when read out.
Having that inconsistency seems absolutely maddness. It's obviously very small, but they should be both treated the same.