Fix validation issue with (dynamically) optional field

src/openforms/submissions/form_logic.py

@@ -12,14 +12,9 @@
 from openforms.formio.utils import get_component_empty_value
 from openforms.typing import DataMapping
 
-from .logic.actions import PropertyAction
+from .logic.actions import ActionOperation
 from .logic.datastructures import DataContainer
-from .logic.rules import (
-    EvaluatedRule,
-    get_current_step,
-    get_rules_to_evaluate,
-    iter_evaluate_rules,
-)
+from .logic.rules import EvaluatedRule, get_rules_to_evaluate, iter_evaluate_rules
 from .models.submission_step import DirtyData
 
 if TYPE_CHECKING:
@@ -205,7 +200,6 @@ def check_submission_logic(
     if not submission_state.form_steps:
         return
 
-    step = get_current_step(submission)
     rules = get_rules_to_evaluate(submission)
 
     # load the data state and all variables
@@ -214,15 +208,19 @@ def check_submission_logic(
         submission_variables_state.set_values(unsaved_data)
     data_container = DataContainer(state=submission_variables_state)
 
-    mutation_operations = []
+    mutation_operations: list[ActionOperation] = []
     for operation in iter_evaluate_rules(rules, data_container, submission):
-        # component mutations can be skipped as we're not in the context of a single
-        # form step.
-        if isinstance(operation, PropertyAction):
-            continue
         mutation_operations.append(operation)
 
+    # we loop over all steps because we have validations that ensure unique component
+    # keys across multiple steps for the whole form.
+    #
+    # We need to apply all component mutations at this stage too, because for validation
+    # reasons, a serializer is built from them.
     for mutation in mutation_operations:
-        mutation.apply(step, {})
+        for step in submission_state.submission_steps:
+            assert step.form_step
+            configuration = step.form_step.form_definition.configuration_wrapper
+            mutation.apply(step, configuration)
 
     submission._form_logic_evaluated = True

src/openforms/tests/e2e/test_input_validation_regressions.py

@@ -5,7 +5,11 @@
 from furl import furl
 from playwright.async_api import expect
 
-from openforms.forms.tests.factories import FormFactory, FormStepFactory
+from openforms.forms.tests.factories import (
+    FormFactory,
+    FormLogicFactory,
+    FormStepFactory,
+)
 
 from .base import E2ETestCase, browser_page
 
@@ -226,3 +230,84 @@ def setUpTestData():
             await expect(
                 page.get_by_text("Een moment geduld", exact=False)
             ).to_be_visible()
+
+    @tag("dh-671")
+    async def test_component_not_required_via_logic(self):
+        @sync_to_async
+        def setUpTestData():
+            form = FormFactory.create(
+                slug="validation",
+                generate_minimal_setup=True,
+                registration_backend=None,
+                translation_enabled=False,  # force Dutch
+                ask_privacy_consent=False,
+                ask_statement_of_truth=False,
+                formstep__next_text="Volgende",
+                formstep__form_definition__configuration={
+                    "components": [
+                        {
+                            "type": "textfield",
+                            "key": "textfield",
+                            "label": "Visible text field",
+                            "validate": {"required": True},
+                        },
+                    ]
+                },
+            )
+            # add a second step
+            FormStepFactory.create(
+                form=form,
+                next_text="Volgende",
+                is_applicable=True,  # should not be validated
+                form_definition__configuration={
+                    "components": [
+                        {
+                            "type": "textfield",
+                            "key": "textfield2",
+                            "label": "Textfield 2",
+                            "validate": {"required": False},
+                        },
+                    ]
+                },
+            )
+            FormLogicFactory.create(
+                form=form,
+                json_logic_trigger=True,
+                actions=[
+                    {
+                        "component": "textfield",
+                        "formStepUuid": None,
+                        "action": {
+                            "type": "property",
+                            "property": {"value": "validate.required", "type": "bool"},
+                            "state": False,
+                        },
+                    }
+                ],
+            )
+            return form
+
+        form = await setUpTestData()
+        form_url = str(
+            furl(self.live_server_url)
+            / reverse("forms:form-detail", kwargs={"slug": form.slug})
+        )
+
+        async with browser_page() as page:
+            await page.goto(form_url)
+            # Start the form
+            await page.get_by_role("button", name="Formulier starten").click()
+
+            # Confirm first step is visible
+            await expect(page.get_by_label("Visible text field")).to_be_visible()
+            await page.get_by_role("button", name="Volgende").click()
+
+            # Handle second step
+            await expect(page.get_by_label("Textfield 2")).to_be_visible()
+            await page.get_by_role("button", name="Volgende").click()
+
+            # Confirm and finish the form
+            await page.get_by_role("button", name="Verzenden").click()
+            await expect(
+                page.get_by_text("Een moment geduld", exact=False)
+            ).to_be_visible()