if using jackson, gson imports are still present

I'm new so this could be an invalid report. But when I add the extra option to generate jackson, I still see gson imports, which are unused but will make builds fail.

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonValue;
import com.google.gson.TypeAdapter;
import com.google.gson.annotations.JsonAdapter;
import com.google.gson.annotations.SerializedName;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;

Start by tracing the extra option that generates Jackson output and inspect how the listed imports are selected. Reproduce generation with that option, then confirm the generated source contains only the imports required for Jackson and builds without unused Gson references.