Posted by perepujal on Apr 18, 2021; 12:19am
URL: https://forum.librecad.org/LibreCad-crashes-following-layer-remove-and-then-file-save-dxf-file-is-corrupted-tp5720548p5720582.html

Another test:
with current git
In case the weird connections between layers were inside the block, select the block, modify attributes, mark apply attributes block deep and select the new.4912.outline layer
Did not solve the problem but seemed a step forward.

Then tried copying all the entities to another place in the draw and remove the original ones with the hope that the weirdness was not copied (I did it with CTRL C CTRL V in case it is different than copying via menus)
saved
opened with 2.1.3 and all seemed ok, saved again with 2.1.3
opened with current git and seems ok

Most likely there is still some issue here that I didn't see, Could somebody test the attached file?
carport-test2.dxf