UUM-146179

Fixed in 6000.6.0b5

Mentioned in 10 release notes.

First fixed in 6000.6.0b5 (Jul 22, 2026); relisted in 9 later releases.

Open on Unity Issue Tracker
VersionSectionRiskImpactNote
6000.6.0b9Fixes
UI Toolkit
FixFixed "Accessing invalid property" errors when entering Play mode after modifying a UXML asset.
6000.6.0b8Fixes
UI Toolkit
FixFixed "Accessing invalid property" errors when entering Play mode after modifying a UXML asset.
6000.7.0a4Fixes
UI Toolkit
FixFixed an issue where "Accessing invalid property" errors occurred when entering Play mode after modifying a UXML asset.
6000.6.0b7Fixes
UI Toolkit
FixFixed "Accessing invalid property" errors when entering Play mode after modifying a UXML asset.
6000.6.0b6Fixes
UI Toolkit
FixFixed "Accessing invalid property" errors when entering Play mode after modifying a UXML asset.
6000.7.0a3Fixes
UI Toolkit
FixFixed an issue where "Accessing invalid property" errors occurred when entering Play mode after modifying a UXML asset.
6000.7.0a3Fixes
UI Toolkit
FixFixed an issue where "Accessing invalid property" errors occurred when entering Play mode after modifying a UXML asset.
6000.5.5f1Fixes
UI Toolkit
FixFixed "Accessing invalid property" errors when entering Play mode after modifying a UXML asset.
6000.6.0b5Fixes
UI Toolkit
FixFixed "Accessing invalid property" errors when entering Play mode after modifying a UXML asset.
6000.6.0b5Fixes
UI Toolkit
FixFixed "Accessing invalid property" errors when entering Play mode after modifying a UXML asset.

Pick your Unity version

Unity Releases compares releases against the version your project is on. Picking it now keeps Compare versions focused on what changes between where you are and where you might be going.