Let's assume we had a file with such a content:
"
A
B
C
D
E
"
We changed the file to:
"
a
C

E
"

Patch =
ChangeDelta, position=0, lines = [A, B] to [a]
UnchangedDelta, position=2, lines = [C] to [C]
ChangeDelta, position=3, lines = [D] to []
UnchangedDelta, position=4, lines = [E] to [E]

DiffRows =
CHANGE, "A" -> "a"
CHANGE, "B" -> ""
CHANGE, "C" -> "C"
CHANGE, "D" -> ""
CHANGE, "E" -> "E"

So DiffRows mixed two absolutely different situations:
CHANGE, "B" -> "" - that was a part of change but has no correspondence in the new file (maybe only "no line")
CHANGE, "D" -> "" - that was actually changed to the empty line

And we cannot distinguish what line in the new file is for E now.
3, 4, or 5?

I offer to set not CHANGE but DELETE for the situation "B" -> "" (or insert vice versa).
Yes it was a part of the change section but in terms of lines it is a deletion. There was a line and there is no line now.
The expected result is:
CHANGE, "A" -> "a"
DELETE, "B" -> ""
CHANGE, "C" -> "C"
CHANGE, "D" -> ""
CHANGE, "E" -> "E"

Another possible solution is to use null for "B" -> "" that can help distinguish two options. But we need to work with null after that.
CHANGE, "A" -> "a"
CHANGE, "B" -> null
CHANGE, "C" -> "C"
CHANGE, "D" -> ""
CHANGE, "E" -> "E"

The error exists in the last version.