1.15 pre7 wrong duration saturation effect

When I was testing on 1.15 pre 7 I've came to a issue which occured during the use of the /effect command.

When I tried to use: 

/effect give @p minecraft:saturation 20

The effect only lasted 0 seconds.

And when using:

/effect give @p minecraft:saturation 100

The effect only lasted 4 seconds.

Here's a little video: https://youtu.be/5OC0e2t3RGc