Me neither; when I rebuild my M88/3 engine im 2009, the old 4/85 marked bearings showed no signs of wear. And the UOA's of a friends S38B36 with 310km's show no indication of bearing wear what so ever as well.I have never ever seen S38-B35/M88 84mm, to have baring issues ever also the 3.6 86mm stroke.
The amount of lead in Ficelle's M88/3 certainly is abnormal and I also concur with your advice. The sooner the rod-bearings are inspected the better because it appears as if the second layer may be through and once that happens, the crankshaft will be affected as well. And in if that is the case, the crankshaft needs to be machined to first undersize, which is an engine-out job...... which is nothing more or less then a (bottom-end) engine rebuild.
This certainly might be the result of using low-viscosity engine oil, e.g. a generic 5W30 with a lo low HTHS or an extended service interval with low base-grade oil (5W or lower) that has seen a break-down of the polymer-chains that stabilizes the temperature behavior. Once that happens, an engine oil will break down to ist base-grade, resulting in a much lower viscosity at operating temperature. But this also results in a reduction of the oil-pressure to below the minimum threshold (that should have been observed), especially at lower engine speeds.
Replacing the engine oil does resolve this phenomenon, but does not resolve its result .... excessive bearing wear. Chances are that the situation resolves with replacement of the rod-bearings, especially when the engine does not make any noises, but immediate action is required to prevent further damage.