Inconsistency: While effect bar can show potion levels up to 10, tooltip in potions can only show up to level 6

Don't know whether is this a same issue as MC-10755, but I don't think so since this is not the problem with the effect itself. The problem here can be seen in the screenshot.

Steps to reproduce:

1. 

/give @p potion{CustomPotionColor:2293580,display:{Name:'[{"text":"Potion of Jump Boost 7","italic":false,"color":"#22ff4c"}]'},CustomPotionEffects:[{Id:8,Duration:1800,Amplifier:6}]} 1

2. Look at the tooltip. ❌  It shows potion.potency.6.

3. Drink the potion

4. ✔  The effect bar shows Jump Boost VII as expected.

Note

If you use 

/give @p potion{CustomPotionColor:2293580,display:{Name:'[{"text":"Potion of Jump Boost 7","italic":false,"color":"#22ff4c"}]',Lore:['[{"text":"Jump  Boost VII (0:15)","italic":false,"color":"blue"}]']},HideFlags:32,CustomPotionEffects:[{Id:8,Duration:3600,Amplifier:6}]} 1

, the tooltip will be shown as expected.