Why doesn't the od command pass output to the pipe?

Question

linux

When using the od command, no result is passed to the next command through the pipe. Although at the same time there is an output to the console, if not redirected anywhere. Why is that? And is it possible to do it somehow?
This option works:
nc -u -l -p 53 | od -An -t u1 -w1 -v
Everything is displayed in the console as it should.
This option does not work:
nc -u -l -p 53 | od -An -t u1 -w1 -v > result.txt
And this option does not work:

nc -u -l -p 53 | od -An -t u1 -w1 -v | (
read a
echo $a
)

PS: Updated the command

Answer 1

Everything works.
Try
strace -v -f -o log bash -c "cat file | od -An -t u1 -w1 -v > result.txt"
and either see for yourself what happens at the moment the result.txt file is opened and then when you try write to it, or post the resulting log.