Why do some clearly detected traffic signs not show up on the map?

Here are a couple of examples…

The signs are clearly detected. Why don’t the show up on the map?

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Here’s some relevant recent info from another thread, don’t know if you saw it: Object detection not working - #6 by epicspongee

That answers why it may take a while to see detected signs show up on the map. But it doesn’t answer the question as to why signs clearly detected in the sequence don’t show up on the map.

More examples…