New diff plugin ignores some changes

I don't know exactly what happens, but editing a document like this:

version 1.1:

asd

version 2.1:

asd
asd

version 3.1:

asd123
asdasd

And viewing the changes between 1.1 and 3.1 will show only one "asd" changed into "asd123", the second line is completely ignored. The same thing happens when comparing changes between 2.1 and 3.1