They change the route the unit must serve. A previously acceptable arrangement should not be assumed unchanged after pipework alterations.
What the observation means
The number, type and position of fittings need professional consideration with the model's requirements. A pump that still runs may not be clearing as intended.
A useful next step
Provide the alteration history and any available diagram. Stop use if wastewater returns or fails to clear. Do not remove joints or reroute the discharge yourself to test whether a bend is responsible.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.