Blender 4 loop cuts

[juliano7s]

Interestingly, on Blender 4, the loop cuts go through the triangle normally.

[FedPete]

I think, you selected the center (outside) loop of a mirrored house?

[Mohsen_Raji]

Hi Juliano,
Have you merged the vertices at the top ? If not, there is still a short edge at the top of the triangles ( merge by pressing M and selecting “At Centre” from the menu.