From f100e083de725887f5bcb86ee066d55369965d00 Mon Sep 17 00:00:00 2001
From: Preston Vasquez <prestonvasquez@icloud.com>
Date: Mon, 26 Jan 2026 14:38:45 -0700
Subject: [PATCH] fix(serverselector): filter deprioritized candidates by
 address only

---
 .../read/DeprioritizedNearestStateChange.json | 78 +++++++++++++++++++
 .../read/DeprioritizedNearestStateChange.yml  | 41 ++++++++++
 2 files changed, 119 insertions(+)
 create mode 100644 source/server-selection/tests/server_selection/ReplicaSetWithPrimary/read/DeprioritizedNearestStateChange.json
 create mode 100644 source/server-selection/tests/server_selection/ReplicaSetWithPrimary/read/DeprioritizedNearestStateChange.yml

diff --git a/source/server-selection/tests/server_selection/ReplicaSetWithPrimary/read/DeprioritizedNearestStateChange.json b/source/server-selection/tests/server_selection/ReplicaSetWithPrimary/read/DeprioritizedNearestStateChange.json
new file mode 100644
index 0000000000..f1560bc117
--- /dev/null
+++ b/source/server-selection/tests/server_selection/ReplicaSetWithPrimary/read/DeprioritizedNearestStateChange.json
@@ -0,0 +1,78 @@
+{
+  "topology_description": {
+    "type": "ReplicaSetWithPrimary",
+    "servers": [
+      {
+        "address": "b:27017",
+        "avg_rtt_ms": 5,
+        "type": "RSSecondary",
+        "tags": {
+          "data_center": "nyc"
+        }
+      },
+      {
+        "address": "c:27017",
+        "avg_rtt_ms": 100,
+        "type": "RSSecondary",
+        "tags": {
+          "data_center": "nyc"
+        }
+      },
+      {
+        "address": "a:27017",
+        "avg_rtt_ms": 25,
+        "type": "RSPrimary",
+        "tags": {
+          "data_center": "nyc"
+        }
+      }
+    ]
+  },
+  "operation": "read",
+  "read_preference": {
+    "mode": "Nearest",
+    "tag_sets": [
+      {
+        "data_center": "nyc"
+      }
+    ]
+  },
+  "deprioritized_servers": [
+    {
+      "address": "b:27017",
+      "avg_rtt_ms": 50,
+      "type": "RSPrimary",
+      "tags": {
+        "data_center": "nyc"
+      }
+    }
+  ],
+  "suitable_servers": [
+    {
+      "address": "c:27017",
+      "avg_rtt_ms": 100,
+      "type": "RSSecondary",
+      "tags": {
+        "data_center": "nyc"
+      }
+    },
+    {
+      "address": "a:27017",
+      "avg_rtt_ms": 25,
+      "type": "RSPrimary",
+      "tags": {
+        "data_center": "nyc"
+      }
+    }
+  ],
+  "in_latency_window": [
+    {
+      "address": "a:27017",
+      "avg_rtt_ms": 25,
+      "type": "RSPrimary",
+      "tags": {
+        "data_center": "nyc"
+      }
+    }
+  ]
+}
diff --git a/source/server-selection/tests/server_selection/ReplicaSetWithPrimary/read/DeprioritizedNearestStateChange.yml b/source/server-selection/tests/server_selection/ReplicaSetWithPrimary/read/DeprioritizedNearestStateChange.yml
new file mode 100644
index 0000000000..134b12907f
--- /dev/null
+++ b/source/server-selection/tests/server_selection/ReplicaSetWithPrimary/read/DeprioritizedNearestStateChange.yml
@@ -0,0 +1,41 @@
+topology_description:
+  type: ReplicaSetWithPrimary
+  servers:
+    - address: b:27017
+      avg_rtt_ms: 5
+      type: RSSecondary
+      tags:
+        data_center: nyc
+    - &2
+      address: c:27017
+      avg_rtt_ms: 100
+      type: RSSecondary
+      tags:
+        data_center: nyc
+    - &3
+      address: a:27017
+      avg_rtt_ms: 25
+      type: RSPrimary
+      tags:
+        data_center: nyc
+
+operation: read
+
+read_preference:
+  mode: Nearest
+  tag_sets:
+    - data_center: nyc
+
+deprioritized_servers:
+  - address: "b:27017"
+    avg_rtt_ms: 50
+    type: RSPrimary
+    tags:
+      data_center: nyc
+
+suitable_servers:
+  - *2
+  - *3
+
+in_latency_window:
+  - *3