UI: Fix JSON field display in dark mode when using system OS theme detection (#54260)
Restore proper DAG callback execution context (#53684)
Restore get_previous_dagrun functionality for task context (#53655)
Fix scheduler crashes with DetachedInstanceError when processing executor events (#54334)
Fix DetachedInstanceError when accessing DagRun.created_dag_version (#54362)
Fix Task SDK to respect custom default queue configuration from config settings (#52786)
Fix: Cannot edit or delete pools with "/" in the name in the UI (#54268)
Fix: Validate and handle invalid extra field in connections UI and API (#53963, #54034, #54235)
Fix: Apply DAG permission filter to dashboard (#54215)
Fix API validation error when DAG runs have bundle_version but no created_dag_version (#54010)
Fix task configuration defaults not being read from configuration settings (#52871)
Fix duplicate task group prefixes in task IDs when unmapping MappedOperators within TaskGroups (#53532)
Fix custom XCom backends not being used when BaseXCom.get_all() is called (#53814)
Fix xcom_pull ignoring include_prior_dates parameter when map_indexes is not specified (#53809)
Allow setting and deleting Variables and XComs from triggers (#53514)
Fix AttributeError when reading logs for previous task attempts with TaskInstanceHistory (#54114)
Skip database queries for spans and metrics when tracing/metrics are disabled (#54404)
UI: Fix Graph view edge rendering issues for nested task groups with excessive bends and misalignment (#54412)
Allow database downgrade from Airflow 3.x to 2.11 (#54399, #54508)
Reduce excessive warning logs when multiple deferred tasks are queued in triggerer (#54441)
Fix log retrieval failures for in-progress tasks by properly configuring JWT authentication (#54444)
Fix DAG import errors for invalid access control roles to persist consistently in UI (#54432)
Fix task failure callbacks missing end_date and duration by populating TaskInstance data before invoking callbacks (#54458)
Fix task retry overflow errors when calculating next retry datetime by capping delay to maximum configured value (#54460)
Add missing ordering to AssetEvent queries in scheduler to maintain consistent event processing order (#52231)
Fix XCom lookup failures in nested mapped task groups by correctly resolving map_index for upstream tasks (#54249)
UI: Fix task name indentation in Graph view for deeply nested task groups beyond 5 levels (#54419)
Run failure callbacks for task instances that get stuck in queued state and fail after requeue attempts (#54401)
Make secrets masking work when connections are loaded from secrets backends (#54574, #54612)

Miscellaneous

Set minimum version for common.messaging to 1.0.3 (#54176)
Add IP validation to example_dag_decorator DAG (#54208)

Doc Only Changes

Fix doc redirects for operators moved to the standard provider (#54251)
Add FAQ entry about testing connections and "Canary" Dag (#54151)
Add note about ruff rules and preview flag (#53331)
Fix broken link in advanced logging config docs (#53460)
Update dag bundles docs; add s3, fix git classpath (#53473)
Fix example to use proper task context and logging instead of dag.log (#54463)
Improve documentation navigation by hiding Public Interface subsections from sidebar while preserving page links (#54465)

Full Changelog: https://github.com/apache/airflow/compare/3.0.4...3.0.5