When using the "|" operator to separate "Category | Subcategory" inside a UPROPERTY, a blueprint based on the class will show Category | Subcategory AS the category name instead of listing a category containing a subcategory.
The Category / Subcategory appear correctly inside the right-click menu in blueprints.
When MyActorBP is opened, category for IgnitionTemp is shown as "Creature|Thermal"
Details panel shows Creature as the category and Thermal as a subcategory where IgnitionTemp exists
Head over to the existing Questions & Answers thread and let us know what's up.