Issues

• Prevent backend main-thread blocking during iModel opening and RPC processing

  needs triageperformance
  iTwin/itwinjs-core#9881 · Filter by author andrewdinunzio opened on Oct 26, 2026
  2

• Parser failure with velocity formats

  needs triagequantity
  iTwin/itwinjs-core#9880 · Filter by author bsy-nicholasw opened on Oct 26, 2026

• ecschema-editing package classifies array bounds mismatches as difference, but then error is thrown on schema union import

  needs triage
  iTwin/itwinjs-core#9873 · Filter by author JulijaRamoskiene opened on Oct 26, 2026
  

• Hard crash when calling deleteElements

  editingtransformers
  Bug

  iTwin/itwinjs-core#9871 · Filter by author ColinKerr opened on Oct 25, 2026
  2

  

• Support new BCV stats fields once they are available

  Enhancement

  iTwin/itwinjs-core#9868 · Filter by author tcobbs-bentley opened on Oct 23, 2026 · iTwin.js 5.15
  

• Improve CASTing in ECSQL

  ecdbneeds triage
  iTwin/itwinjs-core#9866 · Filter by author khanaffan opened on Oct 23, 2026
  2

• SchemaView: first binary format evolution (v2)

  ecschema
  Enhancement

  iTwin/itwinjs-core#9865 · Filter by author rschili opened on Oct 23, 2026

• regionBooleanXY returns undefined or an incomplete union for a circle sharing an arc with a near-tangent boundary

  geometry
  Bug

  iTwin/itwinjs-core#9857 · Filter by author maquemob opened on Oct 22, 2026

• Add a way to block new tools from starting

  needs triagetools
  iTwin/itwinjs-core#9854 · Filter by author Rock2000 opened on Oct 21, 2026
  5

• Update iTwin.js sample iModels with FederationGuids

  iTwin/itwinjs-core#9847 · Filter by author johnnyd710 opened on Oct 20, 2026
  1

• Attached Drawings Stale after update

  needs triage
  iTwin/itwinjs-core#9845 · Filter by author Ellord207 opened on Oct 20, 2026
  

• ECSql Instance Query enhancement - filter classes searched to only those which define one of multiple properties.

  iTwin/itwinjs-core#9843 · Filter by author ColinKerr opened on Oct 18, 2026
  1

• Documentation Issue: "https://www.itwinjs.org/v4/learning/tutorials/v4/learning/tutorials/hello-world-viewer" results into 404

  iTwin/itwinjs-core#9842 · Filter by author Pa3kc123 opened on Oct 18, 2026

• [ecschema-metadata] FormatSetFormatsProvider: add a read-only formatSet getter and make the provider the only way to change formats

  iTwin/itwinjs-core#9834 · Filter by author hl662 opened on Oct 14, 2026

• Docs: Link deprecation replacement

  documentation
  iTwin/itwinjs-core#9831 · Filter by author ben-polinsky opened on Oct 13, 2026

• Semantic rebase can leave orphan physical columns when the incoming schema supersedes a local schema that added columns

  ecdb
  iTwin/itwinjs-core#9827 · Filter by author khanaffan opened on Oct 13, 2026

• Map imagery does not recover after network comes back (failed loads cached as NotFound)

  displaymap-realityneeds triage
  iTwin/itwinjs-core#9824 · Filter by author rowmanempire opened on Oct 13, 2026

• Move submodel class validation to TypeScript

  ecdbeditingnativeneeds triage
  iTwin/itwinjs-core#9810 · Filter by author tigistmebrate11 opened on Oct 7, 2026

• PolyfaceRangeTreeContext - expose more APIs/building blocks

  geometryneeds triage
  Enhancement

  iTwin/itwinjs-core#9809 · Filter by author a-gagnon opened on Oct 7, 2026

• SchemaView: Property categories should be inherited from base properties

  ecschema
  Bug

  iTwin/itwinjs-core#9801 · Filter by author grigasp opened on Oct 6, 2026
  1

  

• Move TypeScript schema libraries to a separate repository

  ecschema
  Initiative

  iTwin/itwinjs-core#9793 · Filter by author rschili opened on Oct 3, 2026

• Decoration graphics are clipped

  displayneeds triage
  iTwin/itwinjs-core#9785 · Filter by author a-gagnon opened on Oct 1, 2026

• ElementDrivesTextAnnotation.updateFieldDependencies recurses to stack overflow when disableThinnedNativeInstanceWorkflow: true

  needs triage
  Bug

  iTwin/itwinjs-core#9779 · Filter by author matthaleky opened on Sep 30, 2026
  1

• Expose ECSqlReader constructor

  confusing API
  Enhancement

  iTwin/itwinjs-core#9769 · Filter by author JonasDov opened on Sep 29, 2026

• ECSql query incorrectly returns no rows

  needs triage
  iTwin/itwinjs-core#9766 · Filter by author ColinKerr opened on Sep 28, 2026