Cannot build a runtime observer system using a closure

[Stumblinbear]

Bevy version

0.16

What you did

I'm attempting to create an observer system at runtime that needs to query components created at runtime.

let system = (QueryParamBuilder::new(|builder| {
    builder.mut_id(dynamic_component_id);
}),)
    .build_state(world)
    .build_system_with_input(
        |trigger: Trigger<OnAdd>, query: Query<FilteredEntityMut>| {},
    );

What went wrong

When calling build_system_with_input with a closure, I get the following error:

help: the trait `bevy::prelude::SystemParamFunction<_>` is not implemented for closure

However, if this is broken out into a free function with the same signature and called that way, it works fine:

fn dynamic_observer_system(trigger: Trigger<OnAdd>, query: Query<FilteredEntityMut>) { }

let system = (QueryParamBuilder::new(|builder| {
    builder.mut_id(dynamic_component_id);
}),)
    .build_state(world)
    .build_system_with_input(dynamic_observer_system);

It is not necessary to have the Query to reproduce the issue, but I included it for a more accurate view of what I was attempting to accomplish. This still fails:

let system = ().build_state(world).build_system_with_input(|trigger: Trigger<OnAdd>| {});

Additional information

This only seems to apply to observer systems; creating non-observer systems with a closure using build_system or build_system_with_input seems to work perfectly fine.

I was hoping to capture a couple of variables in the closure for use in the system, but this limitation means I have to store those extra variables in a resource and do a lookup each time it's triggered. I'm unsure what specifically is causing this issue, as the various generic bounds and impls are difficult to understand from an outsider perspective