speed limit sign recognition

My M3 has recently stopped recognising 100 k speed limit signs. All other speeds are recognised (by visualisation and changing screen display) but not 100. This is new, and weird. Anybody else?

The speed limit sign feature is cool, and works well on the standard white signs. Here are some examples where my M3 did not see the sign at all Electronic displays Yellow (off-ramp) signs

Sorry if this has been discussed ad nausea previously - I cannot find any threads: I know speed limit recognition works on the El Cheapo airport Renault rental and based on this forum for Tesla AP1. And, even better, as of late, stop sign and traffic light recognition has been added, kind of...