No that’s not a cause for concern.
However, I personally caution against reading too much into the blood measurements of others who “aren’t diabetic” given that some data suggests upwards of 50% of the population (in the US admittedly) have some level of undiagnosed metabolic dysfunction and hyperinsulinemia.
But besides that, ~8mmol/L is not likely to be causing any real harm in the short term. Whether or not it’s acceptable to the individual is a personal matter. I wouldn’t worry too much, though I also wouldn’t make a habit of it, but that is just me. Some also believe that whole body glucose is as important as the measurable “overspill” of blood glucose, but there’s no need to go into that here.