Absorption/disruption is not stealthy, as it disrupts the environment in a way that can be detected and with multiple reference points could pinpoint the exactly shape, size, and positioning of the stealth fields.
The best stealth would absorb the signals/particles, then remit them on the other end with a differing strength or other properties (as well as the right timing) that an onboard quantum computer would detect would be the normal difference had the signals/particles had it passed through the typical area of space had there been nothing out of the ordinary to get in their way. (This requires extremely fast computing speeds and faster-than-light wiring to achieve, meaning most civilizations would settle with redirecting particles and signals around the vessel and trying to align them as best they can on their way out to cover their tracks, even if such leaves imperfections.)
A system that doesn't remit the signals or particles on the other end will create a blind spot in the usual phenomena they would observe around them in their environment -- generating from the perspective of the sensor a "Cone of Uncertainty" where objects could possibly exist along the cone depending on what size the object is. Allowing metrics like the usual sizes of ships or projected energy fields from ships to be used to narrow down the potential positioning of the object even from a single observer's lone sensor data. With multiple sensors in other locations, they can interlock their cones and generate the real exact positioning of the disruption as well as it's exact shape and size as well as it's rate of travel and it's trajectory.
This is a significant enough amount of data that it could be used to direct weapons fire against the stealth field even if the exact positioning of objects within the stealth field is impossible to know.
However, the speed of light is an important metric for the stealth of spacecraft. As this system's traits cannot be detected if it drops out to a different stealth method more appropriate for immediate field work at the right distance and the light doesn't catch up to the sensors in time before the operation is completed. (Making the system as described very useful as a counter to Faster-than-light radar/sonar analgoues and allowing the fleet to not immediately be detected from extremely long ranges)