For some reason I can't spawn a creeper with speed using commands, any other effect works but speed doesn't work. The mob spawns but isn't affected for some reason.
The below command is what i used.
/summon creeper ~ ~ ~ {ActiveEffects:[{Id:1b,Amplifier:10b,Duration:10000}]}
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I am unable to reproduce this.

All you should do to reproduce this is go to 1.16.1 use the command I wrote and check if the creeper is faster. If he isn't it's broken.

Please provide a screenshot of your game with the F3 debug screen enabled.


I mean it can spawn the creeper, and it even has visible particles. But it simply isn't affected by the speed, when it chases me it has the normal speed.

Does it work when setting it to a supported level of speed? (Any level above 5 is not supported officially)
See MC-32575

It works with levels below 5! 😃