diff --git a/src/glitchup_bot/glitchtip_client/client.py b/src/glitchup_bot/glitchtip_client/client.py
index 694b476..d6a43b2 100644
--- a/src/glitchup_bot/glitchtip_client/client.py
+++ b/src/glitchup_bot/glitchtip_client/client.py
@@ -52,6 +52,36 @@ class GlitchTipClient:
 
         return results
 
+    async def _get_paginated_with_fallbacks(
+        self,
+        path: str,
+        param_candidates: list[dict],
+        *,
+        fallback_filter=None,
+    ) -> list:
+        last_error: Exception | None = None
+
+        for index, candidate in enumerate(param_candidates):
+            try:
+                results = await self._get_paginated(path, params=candidate)
+                if fallback_filter is not None:
+                    results = [item for item in results if fallback_filter(item)]
+                return results
+            except httpx.HTTPStatusError as exc:
+                last_error = exc
+                if exc.response.status_code != 422 or index == len(param_candidates) - 1:
+                    raise
+
+                logger.warning(
+                    "GlitchTip rejected issue query params for %s with 422; "
+                    "retrying with a simpler request",
+                    path,
+                )
+
+        if last_error is not None:
+            raise last_error
+        return []
+
     @staticmethod
     def _parse_next_cursor(link_header: str) -> str | None:
         for part in link_header.split(","):
@@ -72,9 +102,17 @@ class GlitchTipClient:
     async def list_issues(
         self, project_slug: str, query: str = "is:unresolved", sort: str = "date"
     ) -> list[dict]:
-        return await self._get_paginated(
-            f"/api/0/projects/{settings.glitchtip_org_slug}/{project_slug}/issues/",
-            params={"query": query, "sort": sort},
+        path = f"/api/0/projects/{settings.glitchtip_org_slug}/{project_slug}/issues/"
+        return await self._get_paginated_with_fallbacks(
+            path,
+            [
+                {"query": query, "sort": sort},
+                {"query": query},
+                {},
+            ],
+            fallback_filter=(
+                lambda issue: (issue.get("status") or "unresolved").lower() == "unresolved"
+            ),
         )
 
     async def get_issue(self, issue_id: int) -> dict:
diff --git a/tests/test_glitchtip_client.py b/tests/test_glitchtip_client.py
new file mode 100644
index 0000000..7f0d22e
--- /dev/null
+++ b/tests/test_glitchtip_client.py
@@ -0,0 +1,63 @@
+import httpx
+import pytest
+
+from glitchup_bot.glitchtip_client.client import GlitchTipClient
+
+
+@pytest.mark.asyncio
+async def test_list_issues_retries_without_query_params_on_422() -> None:
+    attempts: list[dict[str, str | int]] = []
+
+    def handler(request: httpx.Request) -> httpx.Response:
+        attempts.append(dict(request.url.params))
+
+        if len(attempts) < 3:
+            return httpx.Response(422, request=request, json={"detail": "bad query"})
+
+        return httpx.Response(
+            200,
+            request=request,
+            json=[
+                {"id": "1", "status": "unresolved", "title": "keep"},
+                {"id": "2", "status": "resolved", "title": "drop"},
+            ],
+            headers={"link": ""},
+        )
+
+    client = GlitchTipClient()
+    client._client = httpx.AsyncClient(
+        base_url=client.base_url,
+        headers=client.headers,
+        transport=httpx.MockTransport(handler),
+    )
+
+    try:
+        issues = await client.list_issues("backend-production")
+    finally:
+        await client.close()
+
+    assert [issue["id"] for issue in issues] == ["1"]
+    assert attempts == [
+        {"query": "is:unresolved", "sort": "date", "limit": "100"},
+        {"query": "is:unresolved", "limit": "100"},
+        {"limit": "100"},
+    ]
+
+
+@pytest.mark.asyncio
+async def test_list_issues_preserves_non_422_errors() -> None:
+    def handler(request: httpx.Request) -> httpx.Response:
+        return httpx.Response(500, request=request, json={"detail": "server error"})
+
+    client = GlitchTipClient()
+    client._client = httpx.AsyncClient(
+        base_url=client.base_url,
+        headers=client.headers,
+        transport=httpx.MockTransport(handler),
+    )
+
+    try:
+        with pytest.raises(httpx.HTTPStatusError):
+            await client.list_issues("backend-production")
+    finally:
+        await client.close()