Clashing texture names on fbx import

Hi, moving from Unity to Unreal.

I have a problem with many textures being renamed for no reason on fbx import. I get warning dialog that texture names clashes, even if there is no other texture named like that. Textures then are renamed e.g. from house_1 to house_1_1.

How do I avoid that? And maybe some other general tips to how to deal with importing fbx files?
P.s. this problem does not exists with the same fbx file in Unity. Thank you!