nodes unconnected to output nodes cause bugs sometimes

for example if i disabled output nodes (such as height, textures, trees, forest, objects), or if i removed them completely, then some nodes will still work and cause weird bugs or at the very least they will still be taken into account when generating the terrain, which causes weird output

it happened to me few times and i always spend considerable time searching for the issue being confident that nodes unconnected to the output arent taken into account but it seems they are