I just want to add the solution from discord here as it might be useful for others as well
@WolfhunterHUN you need to locate your tmx files in windows, right click on one of them and click on "open with" then select tileZed and select "always use this program", now when you right click on a cell in worldEd and click open in TIlezed it should work
click on edit and then preferences and then on the zomboid tab. The "WorldEd Project Files" section must include your map mods pzw file. Click on the little + button, navigate to your map files and select the pzw file. Once done, completely close Tilezed and worldEd etc and then open Tilezed back up, now when you open a cell from worldEd it should show you all your placed lots on that cell too.