diff --git a/docs/configuration/registration/zgw.rst b/docs/configuration/registration/zgw.rst
index ab8a34cfc6..5e01e771cb 100644
--- a/docs/configuration/registration/zgw.rst
+++ b/docs/configuration/registration/zgw.rst
@@ -7,7 +7,7 @@ ZGW API's
 The `ZGW (Zaakgericht Werken) API's`_ are a suite of REST based Zaak services.
 Open Forms can be configured to access these API's to register form submissions.
 
-.. _`ZGW (Zaakgericht Werken) API's`: https://vng.nl/projecten/zaakgericht-werken-api
+.. _`ZGW (Zaakgericht Werken) API's`: https://vng-realisatie.github.io/gemma-zaken/standaard/
 
 .. note::
 
diff --git a/src/openforms/formio/utils.py b/src/openforms/formio/utils.py
index 0776e4cc38..72ec227e21 100644
--- a/src/openforms/formio/utils.py
+++ b/src/openforms/formio/utils.py
@@ -1,3 +1,4 @@
+import json
 import logging
 from dataclasses import dataclass
 from typing import Any, Dict, Iterator, List, Optional, Tuple, TypeAlias, TypeGuard
@@ -343,6 +344,12 @@ def is_visible_in_frontend(component: Component, data: DataMapping) -> bool:
     if isinstance(trigger_component_value, bool):
         compare_value = {"true": True, "false": False}.get(compare_value, False)
 
+    # Issue #3964 - The values of number/currency components are numbers, but in Formio frontend logic they are strings.
+    if isinstance(trigger_component_value, (int, float)) and isinstance(
+        compare_value, str
+    ):
+        compare_value = json.loads(compare_value)
+
     return (
         conditional_show
         if trigger_component_value == compare_value
diff --git a/src/openforms/logging/logevent.py b/src/openforms/logging/logevent.py
index 8d63d46c52..670f49fb3a 100644
--- a/src/openforms/logging/logevent.py
+++ b/src/openforms/logging/logevent.py
@@ -266,7 +266,7 @@ def registration_skipped_not_yet_paid(submission: "Submission"):
 
 
 def confirmation_email_scheduled(
-    submission: Submission, scheduling_options: dict
+    submission: "Submission", scheduling_options: dict
 ) -> None:
     _create_log(
         submission, "confirmation_email_scheduled", extra_data=scheduling_options
diff --git a/src/openforms/submissions/tests/factories.py b/src/openforms/submissions/tests/factories.py
index a18d3e6796..de7d216682 100644
--- a/src/openforms/submissions/tests/factories.py
+++ b/src/openforms/submissions/tests/factories.py
@@ -32,6 +32,7 @@
     SubmissionValueVariable,
     TemporaryFileUpload,
 )
+from ..public_references import get_random_reference
 
 
 class SubmissionFactory(factory.django.DjangoModelFactory):
@@ -127,6 +128,10 @@ class Params:
                 status=PaymentStatus.registered,
             ),
         )
+        with_public_registration_reference = factory.Trait(
+            completed=True,
+            public_registration_reference=factory.LazyFunction(get_random_reference),
+        )
 
     @factory.post_generation
     def prefill_data(obj, create, extracted, **kwargs):
diff --git a/src/openforms/submissions/tests/form_logic/test_modify_components.py b/src/openforms/submissions/tests/form_logic/test_modify_components.py
index e32dc62309..91e6b64b6c 100644
--- a/src/openforms/submissions/tests/form_logic/test_modify_components.py
+++ b/src/openforms/submissions/tests/form_logic/test_modify_components.py
@@ -1046,6 +1046,75 @@ def test_checkbox_frontend_logic(self):
 
         self.assertEqual(submission_step.data["textField"], "Test value")
 
+    @tag("gh-3964")
+    def test_number_frontend_logic(self):
+        form = FormFactory.create()
+        step = FormStepFactory.create(
+            form=form,
+            form_definition__configuration={
+                "components": [
+                    {
+                        "key": "number",
+                        "type": "number",
+                    },
+                    {
+                        "key": "currency",
+                        "type": "currency",
+                    },
+                    {
+                        "key": "anotherNumber",
+                        "type": "number",
+                    },
+                    {
+                        "key": "textField1",
+                        "type": "textfield",
+                        "clearOnHide": True,
+                        "conditional": {"eq": "1", "show": True, "when": "number"},
+                    },
+                    {
+                        "key": "textField2",
+                        "type": "textfield",
+                        "clearOnHide": True,
+                        "conditional": {"eq": "1", "show": True, "when": "currency"},
+                    },
+                    {
+                        "key": "textField3",
+                        "type": "textfield",
+                        "clearOnHide": True,
+                        "conditional": {
+                            "eq": "1.5",
+                            "show": True,
+                            "when": "anotherNumber",
+                        },
+                    },
+                ]
+            },
+        )
+
+        submission = SubmissionFactory.create(form=form)
+        submission_step = SubmissionStepFactory.create(
+            submission=submission,
+            form_step=step,
+            data={
+                "number": 1,
+                "currency": 1,
+                "anotherNumber": 1.5,
+                "textField1": "Test value",
+                "textField2": "Test value",
+                "textField3": "Test value",
+            },
+        )
+
+        self.assertEqual(submission_step.data["textField1"], "Test value")
+        self.assertEqual(submission_step.data["textField2"], "Test value")
+        self.assertEqual(submission_step.data["textField3"], "Test value")
+
+        evaluate_form_logic(submission, submission_step, submission.data, dirty=True)
+
+        self.assertEqual(submission_step.data["textField1"], "Test value")
+        self.assertEqual(submission_step.data["textField2"], "Test value")
+        self.assertEqual(submission_step.data["textField3"], "Test value")
+
     @tag("gh-3744")
     def test_postcode_component_made_optional(self):
         form = FormFactory.create()