Inconsistent and cut off output from client.containers.run()

Hello,

I have a maybe specific use case.

I am compiling and running C code inside a docker container.

Here is my python code for running the container:

        with open(f"{abs_path}/pyput", "w") as f:
            f.write(user_input)
        f.close()
.....

        container_run_result = client.containers.run(
            image="gcc",
            remove=True,
            stderr=True,
            volumes=[f"{abs_path}:/usr/src/compiled"],
            working_dir="/usr/src/compiled",
            command=[
                "/bin/bash",
                "-c",
                f'gcc -o compiled {file.filename} && cat pyput | ./compiled && rm -f compiled',
            ],
        )

Everything works fine except the time when I need user input.

For example I have this C code:

#include <stdio.h>

int main () {
   char str1[20], str2[30];

   printf("Enter name: ");
   scanf("%19s", str1);

   printf("Enter your website name: ");
   scanf("%29s", str2);

   printf("Entered Name: %s\n", str1);
   
   printf("Entered Website:%s", str2);
   
   
   return(0);
}

And this user_input

Name
Site

Everything works fine if I try out gcc -o compiled code.c && cat pyput | ./compiled in my command line and even when I try doing this operation through regular docker with command

 docker run --rm -v `pwd`:/usr/src/compiled -w /usr/src/compiled -it gcc /bin/bash -c "gcc -o compiled code.c && cat pyput | ./compiled"

Output is weirdly format but at least whole:

user@USER:~/user/playground$ docker run --rm -v `pwd`:/usr/src/compiled -w /usr/src/compiled -it gcc /bin/bash -c "gcc -o compiled code.c && cat pyput | ./compiled"
Enter name: Enter your website name: Entered Name: Name
Entered Website:Siteuser@USER:~/user/playground$

But for some reason I get this output from client.containers.run() command:

b'Enter name: Enter your website name: Entered Name: Name\n'

And what is even weirder that sometimes command gives correct expected output without me changing anything! (I just need to spam-call this method 5-10 times)

Also, I am getting correct output only when I change my C code to contain one more printf("\n")

#include <stdio.h>

int main () {
   char str1[20], str2[30];

   printf("Enter name: ");
   scanf("%19s", str1);

   printf("Enter your website name: ");
   scanf("%29s", str2);

   printf("Entered Name: %s\n", str1);
   
   
   printf("Entered Website:%s", str2);
   
   printf("\n");
   
   return(0);
}

...and then I'm getting correct output from client.containers.run() function:

b'Enter name: Enter your website name: Entered Name: Name\nEntered Website:Site\n'

Could you please help me with this issue?

Thank you for any help,
Best Regards,

Reproduce the issue through client.containers.run() using the shown gcc command, mounted pyput input, and C program. Compare its captured output with the regular docker command, including cases with and without the final newline. Done means the Python client consistently returns the complete output rather than truncating it.