China DOS Union

Using the batch file below, I want to output the different content in 1.txt and 2.txt to 3.txt
findstr /v /g:d:\1.txt 2.txt>3.txt

Where:
1.txt:
Chinese
morning
evening
2.txt:
Chinese
morning
eveningde

The result output to 3.txt is as follows:
Chinese
morning
eveningde

But if I add the letter a to the first three lines in both .txt documents (other letters work too), then the result in 3.txt is correct:
eveningde
Could some experts please explain why this is? Could it be that findstr can't compare lines that start directly with Chinese characters? Then if the text I want to compare starts with Chinese characters, what should I do?

findstr /v /b /e /g:d:\1.txt 2.txt>3.txt
Exact match from beginning of line to end of line