Niagara Particle Reader with Self

I want to use self-binding in Niagara’s particle attribute reader.
But after using it, I found that it cannot obtain any of its own properties.

A warning will also be issued
LogNiagara: Warning: Source emitter ‘Self’ not found. System: NiagaraSystem

LogNiagara: Warning: ParticleRead: Failed to ‘Get Float By Index’ attribute ‘aa’ System ‘NewNiagaraSystem’ Emitter ‘Self’! Check that the attribute is named correctly.

But when I fill in my own emitter name in Other, the result is correct and my own properties can be returned.