Custom splash potion with commands gives splash water bottle with no effects

❌ Let me start by apologizing for making a duplicate bug report, I'll make it easier for you by saying that is is duplicated by MC-83471. Again, I apologize, I just started and I am not familiar with the search function. ❌

Here's the rest of the bug report anyway:

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When using /give for a custom splash potion, it yields a splash potion with the name "Splash Water Bottle" with the correct texture and effects shown on the item that the command called for, but when thrown, it's a splash water bottle that does not apply any effects. Example below.

Expecting: A splash potion of Jump Boost II for 480 seconds when running the command /give @p splash_potion 1 0 {CustomPotionEffects:[{Id:8,Amplifier:1,Duration:9600}]}

What happens: When potion is thrown, no potion effects are applied.

This can be confirmed by running the correct effected versions and copy/pasting the command: /give @p splash_potion 1 0 {CustomPotionEffects:[{Id:8,Amplifier:1,Duration:9600}]} in Minecraft chat bar.

When done in a command block or in the chat bar, it makes no difference and is the same result.

When getting splash potions from the creative tab, they work just fine, which is why I'm wondering why the command is not working.

Picture 1: Custom potion in inventory (Note the "Splash Water Bottle" as name)

Picture 2: Custom potion being thrown, the sprite is a Splash Water Bottle and has no effects.

Picture 3: Splash Potion of Leaping in creative tab.

Picture 4: Splash Potion of Leaping from creative tab being thrown with proper sprite and particle effects and giving jump boost II.