Working around the fact that react's strict mode initializes compenents twice...

src/store/gpx.ts

@@ -20,6 +20,9 @@ const slice = createSlice({
         action.payload.trkpt
       );
     },
+    clearGPX(state, action) {
+      state[action.payload.trkKey] = initialState.current;
+    },
   },
 });