minecraft:movement component is ignored on entities spawned via /summon, but works fine when used via egg

Builds: 1.16.20
Summary: Unable to change movement speed of entities that are spawned via the /summon command, however it works if they are spawned using their spawn egg

Impact Statement:

Prevents systems that spawns entities with commands from having custom move speeds, having to use a workarounds like a dispenser with spawn eggs or a dummy entity that uses the spawn_entity component

Repro Steps:

Download the attached zombie.json and integrate it into a behavior pack to test
Load a world and run: /summon zombie

Get a zombie spawn egg and spawn it with that, both are scaled twice the size to confirm the modified zombie json is being used.

Observed Results:

The egg spawned zombie moves fast, the other does not

Expected Results:

They should both move fast

Regression Builds:
This has always been an issue