QNEAT does not return null for disconnected nodes

[Sohaahm]

I'm trying to use QNEAT3 in QGIS for computing shortest path for my network, but the result is not accurate .I checked the graph and everything is fine but the problem is it didn't detect disconnected nodes! And it show a distance result for them(I need to find out which nodes were isolated) . does anyone have any idea?

network after EQ.xlsx
nodes.xlsx

My data : 1- line which represent my street after earthquake which caused blocking some segment of the street
2- points : represent street junction and buildings
I want to have a OD matrix (based on shortest path) for every pairs of nodes.

(I checked the result with QGIS network tool and the results does not compatible to each other)