unexpected data loaded into database when used COPY FROM

Hi

When I used COPY FROM command on windows, I found that If the line data ends with a backslash and carriage return/newlines(\r\n),COPY FROM mishandle the line .
As a result, there were unexpected data loaded into database.

The following case can reproduce this issue.
----------------------------------------------------------------------------
Data file:
lines ending with carriage return/newlines(\r\n)
----- test.txt ------
AAA\ ★there is only one Backslash characters (\) in the line end.
BBB
-------------------

Data loading:
#CREATE TABLE copytest( a TEXT);
#COPY copytest FROM '/test.txt';

Data in database:
# SELECT * FROM copytest;
a
-------
aaa\r ★\r is loaded unexpectedly
bbb
(2 rows)
--------------------------------------------------------------------------

In this case , is it better to throw an error to user than to load the unexpected data to database?

Regards,