When breaking a block of stained glass or a stained glass pane, the corresponding particles are opaque instead of translucent. This is not affected by the color of the glass or glass pane. This does not affect unstained glass or unstained glass panes. This happens regardless of the Graphics setting (Fancy or Fast) or the Particles setting.
Linked issues
Attachments
Comments

This is definitely not a dupe. The opacity of the particles has nothing to do with the order in which they are rendered. Additionally, it's a relatively new problem while the linked ticket is years old.
To prove that this has nothing to do with "ordering", start a void superflat world, travel away from the stone platform, and setblock some stained glass. Break it. The particles are still opaque and ugly, even though there's nothing for it to be ordered with.

This precisely. Test it in 1.13 and then 1.14.
Reopened
The foxes will seem to be eating but still is in their mouth and drops it when they die.
Resolving into more detailed report MC-145821
The rendering order of transparent textures is kinda buggy -> MC-9553