diff --git a/src/components/Kyc/__tests__/SumsubKycWrapper.test.tsx b/src/components/Kyc/__tests__/SumsubKycWrapper.test.tsx
new file mode 100644
index 0000000000..317380af89
--- /dev/null
+++ b/src/components/Kyc/__tests__/SumsubKycWrapper.test.tsx
@@ -0,0 +1,109 @@
+import { render, waitFor } from '@testing-library/react'
+import { useEffect, useState } from 'react'
+import { SumsubKycWrapper } from '../SumsubKycWrapper'
+
+// The real Modal is a headlessui <Transition>/<Dialog>, which renders through a
+// Portal: the portal target is created in the portal's OWN effect, so children
+// mount a commit AFTER `visible` flips true. That one-commit delay is the whole
+// bug this suite guards — a plain useRef read in the init effect is null on the
+// pass where visible/accessToken/sdkLoaded are all ready, and a ref is not
+// reactive, so the effect never re-runs and the SDK is never launched.
+jest.mock('@/components/Global/Modal', () => ({
+    __esModule: true,
+    // Named + capitalised so eslint's rules-of-hooks recognises it as a component.
+    default: function MockPortalModal({ visible, children }: { visible: boolean; children: React.ReactNode }) {
+        // `mounted` resets on close so a close/re-open cycle replays the late
+        // mount, exactly like the real portal tearing down and rebuilding.
+        const [mounted, setMounted] = useState(false)
+        useEffect(() => {
+            setMounted(visible)
+        }, [visible])
+        if (!visible || !mounted) return null
+        return <div data-testid="modal">{children}</div>
+    },
+}))
+
+jest.mock('@/components/Global/ActionModal', () => ({ __esModule: true, default: () => null }))
+jest.mock('@/components/Global/Loading', () => ({ __esModule: true, default: () => <div>loading</div> }))
+jest.mock('@/context/ModalsContext', () => ({ useModalsContext: () => ({ setIsSupportModalOpen: jest.fn() }) }))
+
+const launch = jest.fn()
+
+function installSdk() {
+    const builder: Record<string, unknown> = {}
+    builder.withConf = () => builder
+    builder.withOptions = () => builder
+    builder.on = () => builder
+    builder.build = () => ({ launch, destroy: jest.fn() })
+    ;(window as unknown as { snsWebSdk: unknown }).snsWebSdk = { init: () => builder }
+}
+
+describe('SumsubKycWrapper', () => {
+    beforeEach(() => {
+        launch.mockClear()
+        installSdk()
+    })
+
+    afterEach(() => {
+        // don't leak the global — a later test may need the script-loading path
+        // (snsWebSdk absent -> script injected -> onload) to be reachable.
+        delete (window as unknown as { snsWebSdk?: unknown }).snsWebSdk
+    })
+
+    it('launches the SDK when an already-mounted wrapper is opened (portal mounts container late)', async () => {
+        // Faithful to prod: SumsubKycModals keeps this wrapper mounted, so the
+        // websdk script resolves and `sdkLoaded` settles true while hidden. Only
+        // `visible` flips later — and if the init effect bails on a null ref at
+        // that moment, NOTHING else ever changes to re-run it. Mounting straight
+        // to visible instead lets the sdkLoaded flip re-run the effect and hides
+        // the bug entirely.
+        const props = {
+            accessToken: 'tok_abc',
+            onClose: jest.fn(),
+            onComplete: jest.fn(),
+            onRefreshToken: jest.fn().mockResolvedValue('tok_abc'),
+        }
+        // window.snsWebSdk is pre-installed, so the script effect resolves
+        // sdkLoaded->true on mount and render() flushes it inside act(). That is
+        // what makes `visible` the LAST dep to flip — if sdkLoaded flipped after
+        // it instead, that flip would re-run the init effect with the container
+        // already mounted and mask the bug entirely.
+        const { rerender } = render(<SumsubKycWrapper visible={false} {...props} />)
+        expect(launch).not.toHaveBeenCalled()
+
+        rerender(<SumsubKycWrapper visible {...props} />)
+
+        // Regression: before the callback-ref fix this never fired, leaving the
+        // user on an infinite spinner (card_sumsub_opened with 0 completions).
+        await waitFor(() => expect(launch).toHaveBeenCalledTimes(1))
+        expect(launch.mock.calls[0][0]).toBeInstanceOf(HTMLElement)
+    })
+
+    it('does not launch while hidden', async () => {
+        render(
+            <SumsubKycWrapper
+                visible={false}
+                accessToken="tok_abc"
+                onClose={jest.fn()}
+                onComplete={jest.fn()}
+                onRefreshToken={jest.fn().mockResolvedValue('tok_abc')}
+            />
+        )
+        await new Promise((r) => setTimeout(r, 0))
+        expect(launch).not.toHaveBeenCalled()
+    })
+
+    it('does not launch without an access token', async () => {
+        render(
+            <SumsubKycWrapper
+                visible
+                accessToken={null}
+                onClose={jest.fn()}
+                onComplete={jest.fn()}
+                onRefreshToken={jest.fn().mockResolvedValue('tok_abc')}
+            />
+        )
+        await new Promise((r) => setTimeout(r, 0))
+        expect(launch).not.toHaveBeenCalled()
+    })
+})