Change-Tracking with "show-changes" enabled

I stumbled over an interesting scenario myself, when I tested nested
changes with  show-changes  enabled:
We only have a single paragraph, which starts with the content
Abcdefg .
Step 1:
We delete in the middle a part  cde , but use show changes.
Ab  cde  fg
Step 2:
With show changes enabled it is possible to select a position within
the deleted text.
In the deleted text, I added twice a string,  new1  and  new2
Ab  c
new1
d
new2
e  fg
Step 3:
Now we delete again some mixed text, we select and delete  w1ne .
Ab  c
ne
w1
d
ne
w2
e  fg
The result that I got and expected was:
Ab  e
ne
d
w2
e  fg
With the semantic of yellow text being changed text (each color
a user) and underlined meaning  new text  and strike-through meaning
deleted text .
What happened here from an operational point of view?
Interesting, that although there is a deletion of text, the text is
still in the document. There are multiple designs to solve this, for
show-and-tell I suggest to use a deletion with show-changes flavor,
e.g.
<del  type= show-changes  s= /1/3  e= /1/5  />
The effect: The deletion operation stays at a certain point in the
queue (marked at a certain time when deletion was triggered) and the
content to be deleted is not yet taken out.
I believe I figured out what to do, but perhaps someone would like
to take this challenge as an hands-on lab?
PS: When the last result is being copied, only the new part is
inserted:  abnew2fg
Best regards,
Svante