diff --git a/draftlogs/6870_change.md b/draftlogs/6870_change.md
new file mode 100644
index 00000000000..a4764eb9b66
--- /dev/null
+++ b/draftlogs/6870_change.md
@@ -0,0 +1 @@
+- Fix bug where extending an existing box/lasso selection on traces with overlaying axes didn't update the selection [[#6870](https://github.com/plotly/plotly.js/pull/6870)].
\ No newline at end of file
diff --git a/src/components/selections/select.js b/src/components/selections/select.js
index b0d76a1b24f..df6a80c70a8 100644
--- a/src/components/selections/select.js
+++ b/src/components/selections/select.js
@@ -809,8 +809,8 @@ function determineSearchTraces(gd, xAxes, yAxes, subplot) {
             var sankeyInfo = createSearchInfo(trace._module, cd, xAxes[0], yAxes[0]);
             searchTraces.push(sankeyInfo);
         } else {
-            if(xAxisIds.indexOf(trace.xaxis) === -1) continue;
-            if(yAxisIds.indexOf(trace.yaxis) === -1) continue;
+            if(xAxisIds.indexOf(trace.xaxis) === -1 && (!trace._xA || !trace._xA.overlaying)) continue;
+            if(yAxisIds.indexOf(trace.yaxis) === -1 && (!trace._yA || !trace._yA.overlaying)) continue;
 
             searchTraces.push(createSearchInfo(trace._module, cd,
               getFromId(gd, trace.xaxis), getFromId(gd, trace.yaxis)));