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+## Summary
+<!--Explain briefly what goes wrong and explain why you believe this is a bug and not the intended behavior of SQLite (if it is not a crash).-->**No review yet**
+
+## Minimized query
+
+```sql
+ATTACH DATABASE ':memory:' AS aux28;
+CREATE TABLE t1(a INT, b INT);
+INSERT INTO t1(a,b) VALUES(1,null),(null,null),(1,null); /* PRAGMA read_uncommitted = TRUE; */ CREATE UNIQUE INDEX t1b ON t1(abs(b));
+SELECT quote(a), /**/ quote(b), '|' FROM t1 GROUP BY a, abs(b);
+
+REINDEX;
+UPDATE t1 SET b = json_object('k', b) WHERE b IS NOT NULL RETURNING *;
+SELECT STRING_AGG(b, '|') FROM t1;
+DETACH DATABASE aux28;
+VACUUM main;
+CREATE TEMPORARY  VIEW IF NOT EXISTS v_t1_9088 AS SELECT b FROM t1;
+```
+
+## Actual output
+
+```sql
+NULL|NULL||
+1|NULL||
+```
+
+## Expectation
+
+```sql
+
+```
+
+## Flag
+
+```
+
+```
+