Prefab is added to the opened scene whenever you RMB->Create->Prefab in a folder with too long path

How can we reproduce it using the example you attached
1 Open attached project
2 Open scene SampleScene
3 Open folder "123456789..." and in it open subfolder "123456789..."
4 While in that subfolder do RMB->Create->Prefab

Actual results: the exception is thrown in the Console (because path is too long) and Prefab is added to the currently open scene

Expected results: Prefab should not be added to the scene

the project includes long folder names, in case attached project (archive) is broken because of that - you can reproduce it on a new 3D project, steps are:

1 Create new 3D project
2 Open scene SampleScene
3 Create folder called 1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890a1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890a123456781234567890123456789012345678901234567890
4 Open that folder and create subfolder called 1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890a1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890a1234567812345678901234567890123456789
5 Open that subfolder and do RMB->Create->Prefab