Villager item tooltip is opaque in the trading UI

The bug

When hovering over enchanted items, the tooltip is slightly transparent. However, that is not the case with enchanted items in a villager's trade GUI. Instead, the tooltip is opaque.

Steps to Reproduce:

• Summon a villager with trades.

• /summon minecraft:villager ~ ~ ~ {NoAI:1b,Offers:{Recipes:[{buy:{id:"minecraft:emerald",Count:1b},sell:{id:"minecraft:iron_axe",Count:1b,maxUses:9999999}}]}}

• Hold your mouse cursor over the iron axe.
• Look closely at the opacity of the tooltip that's displayed upon doing so.
• Take note as to whether or not tooltips within the villager UI are opaque.