bug#36489: possible bug by sed?

[Steven Abner]

Hi,
Using:
grep -rlI ~/Development/PheonixOS -e 'as_sys_types.h' | xargs sed -i 
's@as_sys_types.h@as_types.h@g'
on ElementaryOS did its job except it truncated a few files' last line. 
In otherwords, file ends up one line
short, and had no replacement on that line.
 Only found problem because of had identical copies on my mac, and did 
same thing, except BSD variant:
grep -rlI ~/Development/Pheonix -e 'as_sys_types.h' | xargs sed -i "" 
's@as_sys_types.h@as_types.h@g'
Then I verify changes by using diff command. Several files on linux 
lost last line.
As stated in subject, 'possible', because it could belong to 'xargs'?
Thx and sorry to contact
Steve