Fix top pages comparison tooltip missing date labels (#6221)

* Fix top pages comparison tooltip missing date labels

- The `/pages` endpoint was using `Map.merge` on a `Jason.OrderedObject`, which silently drops any merged keys during JSON encoding. Convert to a plain map first so date range labels are included in the response.

* Add changelog entry

* Add meta assertions to pages controller tests

Author: sanne-san

CHANGELOG.md

@@ -28,6 +28,7 @@ All notable changes to this project will be documented in this file.
 - Fixed Stats API timeseries returning time buckets falling outside the queried range
 - Fixed issue with all non-interactive events being counted as interactive
 - Fixed countries map countries staying highlighted on Chrome
+- Fixed comparison tooltip in the top pages report missing date labels
 
 ## v3.2.0 - 2026-01-16
 

lib/plausible_web/controllers/api/stats_controller.ex

@@ -723,7 +723,7 @@ defmodule PlausibleWeb.Api.StatsController do
     else
       json(conn, %{
         results: pages,
-        meta: Map.merge(meta, Stats.Breakdown.formatted_date_ranges(query)),
+        meta: Map.new(meta.values) |> Map.merge(Stats.Breakdown.formatted_date_ranges(query)),
         skip_imported_reason: meta[:imports_skip_reason]
       })
     end

test/plausible_web/controllers/api/stats_controller/pages_test.exs

@@ -657,6 +657,8 @@ defmodule PlausibleWeb.Api.StatsController.PagesTest do
                  "percentage" => 100.0
                }
              ]
+
+      assert json_response(conn, 200)["meta"] == %{"date_range_label" => "1 Jan 2021"}
     end
 
     test "returns top pages with :not_member filter on custom pageview props including (none) value",
@@ -2212,6 +2214,11 @@ defmodule PlausibleWeb.Api.StatsController.PagesTest do
                  }
                }
              ]
+
+      assert json_response(conn, 200)["meta"] == %{
+               "date_range_label" => "2 Jan 2021",
+               "comparison_date_range_label" => "1 Jan 2021"
+             }
     end
 
     on_ee do