Issues

• Null compensation is repeated for a nullable subquery used as a value of an inline collection Contains

  customer-reported
  dotnet/efcore#39413 · Filter by author benedict-odonovan opened on Oct 26, 2026

• EF Core 10: after Update throws an identity conflict, the conflicting instance stays tracked as Detached and SaveChanges throws "Unexpected entry.EntityState: Detached

  customer-reported
  dotnet/efcore#39412 · Filter by author jojoman2 opened on Oct 26, 2026

• [dnceng-bot] Branch efcore/release/9.0 can't be merged to Azdo internal branch

  dotnet/efcore#39411 · Filter by author dotnet-mirroring opened on Oct 26, 2026

• Global UseCollation() convention generates uncompilable model snapshot for JSON-mapped ComplexCollection properties

  customer-reported
  dotnet/efcore#39406 · Filter by author alienwareone opened on Oct 25, 2026
  1

• Any method named Compare is translated as the natural comparison of its arguments, so a comparer's own ordering is silently ignored (StringComparer.OrdinalIgnoreCase, custom IComparer<T>)

  dotnet/efcore#39402 · Filter by author CaffeinatedCoder opened on Oct 24, 2026

• Non-auto-loaded properties are not populated on entities even when explicitly selected by FromSql or LINQ projection

  dotnet/efcore#39398 · Filter by author roji opened on Oct 24, 2026

• dotnet ef migrations script --idempotent can generate invalid PostgreSQL SQL

  dotnet/efcore#39396 · Filter by author cdbrown2018 opened on Oct 23, 2026

• SqliteCommand falsely reports bound prefix-less parameters as unbound when another parameter is missing

  area-adonet-sqlite
  Bug

  dotnet/efcore#39370 · Filter by author austinaviv opened on Oct 22, 2026 · 12.0.0

• Query never returns (infinite loop on the client) when grouping by a value-converted reference type and projecting the group's elements

  area-querycustomer-reported
  Bug

  dotnet/efcore#39366 · Filter by author benedict-odonovan opened on Oct 22, 2026 · 12.0-preview1

• Allow providers to customize aggregate lowering of grouped Any/All

  area-query
  Feature

  dotnet/efcore#39363 · Filter by author roji opened on Oct 22, 2026 · Backlog
  1

• Query: The LINQ expression 'p' could not be translated when Any predicate compares parameter with expression referencing parameter (e.g. p => p == p.ToUpper())

  area-primitive-collectionsarea-querycustomer-reported
  Bug

  dotnet/efcore#39351 · Filter by author bkoelman opened on Oct 21, 2026 · 12.0.0
  5

• Translate Enumerable.Concat over byte arrays

  Feature

  dotnet/efcore#39345 · Filter by author roji opened on Oct 20, 2026 · Backlog

• Migrator retains every pending migration's target model for the whole Migrate call

  area-migrationsarea-perf
  Bug

  dotnet/efcore#39339 · Filter by author melfahn opened on Oct 19, 2026 · Backlog

• SQL Server: quadratic parameter-name generation across split queries with MultipleParameters (10.0.13)

  area-perfarea-query
  dotnet/efcore#39333 · Filter by author CalculationCycle opened on Oct 19, 2026 · 12.0.0
  

• Collection Contains normalization rewrites any Contains overload and guesses the element type from the first type argument

  area-query
  Bug

  dotnet/efcore#39329 · Filter by author CaffeinatedCoder opened on Oct 19, 2026 · 12.0.0

• Connection open count survives the reset of a pooled DbContext, so later leases keep the connection open

  area-dbcontextcustomer-reported
  Bug

  dotnet/efcore#39327 · Filter by author dennev opened on Oct 19, 2026 · Backlog

• Projecting a JSON-mapped complex property with AsNoTrackingWithIdentityResolution throws InvalidCastException

  area-complex-typesarea-jsonarea-querycustomer-reported
  Bug

  dotnet/efcore#39322 · Filter by author bkoelman opened on Oct 17, 2026 · 12.0.0
  1

  

• Complete FirstWithoutOrderByAndFilterWarning coverage for subqueries

  area-query
  Task

  dotnet/efcore#39310 · Filter by author AndriySvyryd opened on Oct 17, 2026 · Backlog

• Precompiled queries reconstruct nullable-long coalesce with nullable result in anonymous projection

  area-precompiled-queriesarea-query
  Bug

  dotnet/efcore#39309 · Filter by author nickna opened on Oct 17, 2026 · 12.0-preview1
  1

  

• Precompiled queries evaluate guarded Nullable<T>.Value during design-time parameter extraction

  area-precompiled-queriesarea-query
  Bug

  dotnet/efcore#39308 · Filter by author nickna opened on Oct 17, 2026 · 12.0-preview1
  1

• Query precompiler fails to lift a double branch in a target-typed nullable conditional

  area-precompiled-queries
  Bug

  dotnet/efcore#39304 · Filter by author nickna opened on Oct 16, 2026 · 12.0-preview1
  1

  

• Query precompiler rejects an integer zero implicitly converted to decimal in a projection

  area-precompiled-queries
  Bug

  dotnet/efcore#39303 · Filter by author nickna opened on Oct 16, 2026 · 12.0-preview1
  1

  

• Query precompiler rejects required-member DTO initializer because its constructor translates to an invocation

  area-precompiled-queries
  Bug

  dotnet/efcore#39302 · Filter by author nickna opened on Oct 16, 2026 · 12.0-preview1
  1

  

• Compiled model writes NullableValueComparer<TComparer> (CS0453) for a struct's ValueComparer applied to a nullable property

  area-aotarea-model-buildingcustomer-reported
  Bug

  dotnet/efcore#39291 · Filter by author AdCodicem opened on Oct 16, 2026 · 12.0.0
  

• Azure SQL: JSON_VALUE RETURNING fails when OPENJSON projects nested JSON as nvarchar(max)

  area-jsonarea-queryarea-sqlservercustomer-reportedregression
  Bug

  dotnet/efcore#39277 · Filter by author RanKarat opened on Oct 16, 2026 · 10.0.16
  4