Glowing item & block displays no longer glow

Block and Item displays no longer render Glowing in the latest snapshot of minecraft. This is a visual issue and the data still exists on the entity.

What I expected to happen:

The item and block displays would have a glowing outline on them, as they did in 1.21.8 and all previous versions since their introduction.

What happens:

There is no visual difference between glowing and non-glowing display entities

Commands to Reproduce:

/summon item_display ~ ~ ~ {item:{id:"minecraft:iron_sword",count:1},Glowing:1b}

/summon block_display ~ ~ ~ {block_state:{Name:"minecraft:dirt"},Glowing:1b}