When you do the /attribute command, all modified attributes are supposed to stay at those values. For example, if you type in:

/attribute @s jump_strength base set 1.5

it will stay 1.5 if you exit the game and go back into that world.

However, when you type:

/attribute @s movement_speed base set (any number not 0.1) 

and then you save, quit to title, and go back, it is reset to 0.10000000149011412

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Steps to Reproduce:

1. Go into any Minecraft world
2. 2. Type /attribute @s movement_speed base set 2
3. Notice you are extremely fast
4. Pause the game and click "Save and Quit to Title"
5. Go back into the same Minecraft world

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Expected Result:

You will stay extremely fast and if you do "/attribute @s movement_speed get" it will show 2.0

Observed Result:

You will slow down to the default speed, and if you type in that command mentioned earlier it will show 0.10000000149011412