Hi Gio,
So this is actually normal. With Path Tracer off but GI on, you won't see emissive lighting as pronounced as with Path Tracer on, but it is still present and is much more noticeable the closer you get to the light source. With Path Tracer off, if you toggle GI on and off, you should notice that with GI off, the lighting becomes more muted. If lighting looks identical with GI off and on, then this could be a bug worth investigating further, and we would need the Twinmotion file for that. Right now, Path Tracer provides the best results due to all of the additional computations it uses to produce the render.
Best,
Raghib