diff --git a/client/src/pages/CollectionsPage.test.tsx b/client/src/pages/CollectionsPage.test.tsx
index 1e7634f63..09509527b 100644
--- a/client/src/pages/CollectionsPage.test.tsx
+++ b/client/src/pages/CollectionsPage.test.tsx
@@ -25,7 +25,13 @@ vi.mock('../components/Collections/CollectionFilterBar', () => ({
       ? <button type="button" onClick={props.onAddPlace}>collections.addPlace</button>
       : <div />,
 }))
-vi.mock('../components/Collections/CollectionMapPanel', () => ({ default: () => <div data-testid="map" /> }))
+const mapPanelProps = vi.hoisted(() => ({ current: null as null | { onSelect: (id: number) => void; onDeselect: () => void } }))
+vi.mock('../components/Collections/CollectionMapPanel', () => ({
+  default: (props: { onSelect: (id: number) => void; onDeselect: () => void }) => {
+    mapPanelProps.current = props
+    return <div data-testid="map" />
+  },
+}))
 vi.mock('../components/Collections/CopyToTripModal', () => ({ default: () => null }))
 vi.mock('../components/Collections/MoveToListModal', () => ({ default: () => null }))
 vi.mock('../components/Collections/ShareCollectionModal', () => ({ default: () => null }))
@@ -147,3 +153,17 @@ describe('CollectionsPage — the map survives a filter that matches nothing', (
     expect(screen.queryByTestId('map')).toBeNull()
   })
 })
+
+describe('CollectionsPage: a marker click shows the place (#2431)', () => {
+  it('selects the place a marker stands for, even when that place is already selected', () => {
+    const setSelectedPlaceId = vi.fn()
+    mockUseCollections.mockReturnValue(makeHook({ selectedPlaceId: 10, setSelectedPlaceId }))
+    render(<CollectionsPage />)
+    // A second click on the marker of the open place used to toggle it away, which
+    // read as the details refusing to open. The map background is what clears.
+    mapPanelProps.current!.onSelect(10)
+    expect(setSelectedPlaceId).toHaveBeenLastCalledWith(10)
+    mapPanelProps.current!.onDeselect()
+    expect(setSelectedPlaceId).toHaveBeenLastCalledWith(null)
+  })
+})
diff --git a/client/src/pages/CollectionsPage.tsx b/client/src/pages/CollectionsPage.tsx
index c2e21eb42..21ceecfac 100644
--- a/client/src/pages/CollectionsPage.tsx
+++ b/client/src/pages/CollectionsPage.tsx
@@ -45,12 +45,16 @@ function CollectionsPageDesktop(): React.ReactElement {
   const isRealList = !c.isAllSaved && typeof c.activeId === 'number'
   const canManageLabels = isRealList && c.canEdit
 
-  // Selecting a place toggles it, so clicking it again — or the map background —
-  // clears it. Below the desktop breakpoint the list and map are separate views;
-  // above it the list view is a split with a persistent map that pans to the
-  // selection (the map stays mounted across the list↔map toggle so it animates).
+  // Selecting a place from the list toggles it, so clicking the row again clears
+  // it, as does the map background. A marker click always shows the place: a second
+  // click on the marker of the place that is open read as "the details do not open"
+  // rather than as "close them" (#2431). Below the desktop breakpoint the list and
+  // map are separate views; above it the list view is a split with a persistent map
+  // that pans to the selection (the map stays mounted across the list↔map toggle so
+  // it animates).
   const mappable = c.mappable
   const openPlace = (id: number) => c.setSelectedPlaceId(c.selectedPlaceId === id ? null : id)
+  const showPlace = (id: number) => c.setSelectedPlaceId(id)
   const deselect = () => c.setSelectedPlaceId(null)
   const toggleView = () => {
     // Going to the full-map view closes the (list-docked) detail sheet.
@@ -59,7 +63,7 @@ function CollectionsPageDesktop(): React.ReactElement {
   }
   // Clicking a marker in the full-map view drops back to the split so the list
   // + detail come into view alongside the map.
-  const onMapSelect = (id: number) => { openPlace(id); if (c.view === 'map') c.setView('list') }
+  const onMapSelect = (id: number) => { showPlace(id); if (c.view === 'map') c.setView('list') }
 
   const desktopSplit = c.isWide && c.hasMappable
   const mapShown = c.hasMappable && (c.view === 'map' || c.isWide)