Issues

• Improve remaining JsonReaderInvalidTokenType exceptions during JSON materialization

  customer-reported
  Feature

  dotnet/efcore#39486 · Filter by author Sean-mn opened on Oct 31, 2026

• [JsonPropertyName] is ignored for complex properties and complex collections mapped to JSON

  customer-reported
  dotnet/efcore#39484 · Filter by author proggmatic opened on Oct 31, 2026

• EnableDetailedErrors: nested JSON complex collection with a nullable value-type property throws NotSupportedException (TryExpression) on save and DetectChanges (regression in 11.0)

  area-change-trackingcommunity-contributionregression
  Bug

  dotnet/efcore#39459 · Filter by author tbertran opened on Oct 29, 2026 · 11.0.1
  1

  

• Querying a table-splitting dependent of a derived TPH type returns rows of other types

  area-queryarea-relational-mappingcustomer-reported
  Bug

  dotnet/efcore#39458 · Filter by author jeremy-morren opened on Oct 29, 2026 · Backlog
  1

• SQL Server: a TimeSpan of a day or more in a JSON column is read back wrong, with no error, when a query reads the property

  area-jsonarea-query
  dotnet/efcore#39456 · Filter by author CaffeinatedCoder opened on Oct 29, 2026 · 12.0.0
  

• ToJson complex collection: an explicit DetectChanges() before SaveChanges() silently loses a prepended element and writes the old head twice

  area-complex-typesarea-save-changes
  Bug

  dotnet/efcore#39450 · Filter by author bblankenship78 opened on Oct 29, 2026 · 12.0.0
  

• Query precompiler aliases Skip and Take into a single SQL parameter

  area-aotarea-precompiled-queriesarea-query
  Bug

  dotnet/efcore#39429 · Filter by author rockyway opened on Oct 27, 2026 · 12.0.0
  1

  

• Query precompiler folds conditionals on captured variables using fake defaults and drops a SQL branch

  area-precompiled-queriesarea-query
  Bug

  dotnet/efcore#39428 · Filter by author rockyway opened on Oct 27, 2026 · 12.0.0
  

• Support separate navigation query and update mappings, including read-only navigations

  area-model-buildingarea-queryarea-save-changesneeds-design
  Feature

  dotnet/efcore#39422 · Filter by author AndriySvyryd opened on Oct 26, 2026 · Backlog

• Support configuring a model-level filter on a navigation

  area-query
  Feature

  dotnet/efcore#39421 · Filter by author AndriySvyryd opened on Oct 26, 2026 · Backlog

• Reject member and method translations incompatible with the mapped store representation

  area-query
  Task

  dotnet/efcore#39420 · Filter by author AndriySvyryd opened on Oct 26, 2026 · 12.0.0

• Improve postprocessor extensibility

  area-queryneeds-design
  Feature

  dotnet/efcore#39419 · Filter by author AndriySvyryd opened on Oct 26, 2026 · Backlog

• Improve preprocessor extensibility

  area-queryneeds-design
  Feature

  dotnet/efcore#39418 · Filter by author AndriySvyryd opened on Oct 26, 2026 · Backlog

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

  Task

  dotnet/efcore#39411 · Filter by author dotnet-mirroring opened on Oct 26, 2026 · 9.0.x

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

  area-complex-typesarea-jsoncustomer-reported
  Bug

  dotnet/efcore#39406 · Filter by author alienwareone opened on Oct 25, 2026 · 12.0.0
  2

  

• 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>)

  area-query
  Bug

  dotnet/efcore#39402 · Filter by author CaffeinatedCoder opened on Oct 24, 2026 · 12.0.0
  2

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

  area-query
  Bug

  dotnet/efcore#39398 · Filter by author roji opened on Oct 24, 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
  1

• 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