Setting step for size widget does nothing

[birdddev]

Describe the bug

OS: Arch Linux (6.7.1-zen1-1-zen (64-bit))

Changing the step for a size widget continues to use the default step size for the sliders inside a size widget.

For example, changing prefab_latent_v3.ts:15 to size: form.size({step: ##}), does not actually make the sliders use the overridden step size and continues to use the default.