To reproduce, summon a glowing mob with transparent texture parts or holding an item.
Left: 19w38b, Right: 19w39a
[media][media][media]The glowing shader itself (entity_outline.json) has not been changed. The problem is that what the game renders to the "final" buffer no longer maintains the entity's transparency, instead always having full opacity.
Final buffer in 19w38b. A phantom, and an armor stand holding a stained glass pane. Checkerboard background added by me.
[media]Final buffer in 19w39a:
[media]
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Can confirm, this also affects glow on partial transparency which has a unique look (such as when resource packs use partial transparent textures to glow with, stained panes and other partial transparent items rendered on entities, and slimes) which in 1.14 worked fine. This breaks a really nice visual feature of the glowing effect.
Can confirm.