The dot used do denote capotols in mid-low zoom range became a black circle - solved by using text (🞊 character).
The symbol for gate became a black box - solved by using text (≠, not equal to math symbol). Both text characters are equal to the symbols used in the icon set.
Busstation became a box, that is unsolved for now.
Motorway number signs from the set are not usable as SDF, so I have to provide another icon for that.

There may be more, but theese were what I found so far. On the good side, the color themed icons adds nice value