iprintln!() fails to print after printing certain amount of data

Hello 🦀, when running the program below that repeatedly calls iprintln!(), it always stops printing at the same point in code, not finishing the printing tasks. It should print "Hello World ~" 77 times in a loop, but the program always stops printing in the middle of 26th invocation of iprintln!().

#[entry]
fn main() -> ! {
    if let (Some(dp), Some(mut cp)) = (
        stm32::Peripherals::take(),
        cortex_m::peripheral::Peripherals::take(),
    ) {
        // Set up the system clock. We want to run at 168MHz for this one.
        let rcc = dp.RCC.constrain();
        let clocks = rcc.cfgr.sysclk(168.mhz()).freeze();
        let mut itm = cp.ITM;
        for i in 0..77 {
            iprintln!(&mut itm.stim[0], "Hello World for the {}-th time", i);            
        }

        loop {
            continue;
        }
    }

    // Failed to access peripherals..
    panic!();
}

logs from ITM are stored locally in itm.txt, and the log is always the same as below
(no matter how many times I try running).

Hello World for the 0-th time
Hello World for the 1-th time
Hello World for the 2-th time
Hello World for the 3-th time
Hello World for the 4-th time
Hello World for the 5-th time
Hello World for the 6-th time
Hello World for the 7-th time
Hello World for the 8-th time
Hello World for the 9-th time
Hello World for the 10-th time
Hello World for the 11-th time
Hello World for the 12-th time
Hello World for the 13-th time
Hello World for the 14-th time
Hello World for the 15-th time
Hello World for the 16-th time
Hello World for the 17-th time
Hello World for the 18-th time
Hello World for the 19-th time
Hello World for the 20-th time
Hello World for the 21-th time
Hello World for the 22-th time
Hello World for the 23-th time
Hello World for the 24-th time
Hello World

Is there a maximum limit of data that iprintln! can send in total?
If not, I guess this should be considered a bug..

Metadata

• I used stm32f407g-disc1 board to run this program.
• rustc --version --verbose

rustc 1.46.0-nightly (feb3536eb 2020-06-09)
binary: rustc
commit-hash: feb3536eba10c2e4585d066629598f03d5ddc7c6
commit-date: 2020-06-09
host: x86_64-unknown-linux-gnu
release: 1.46.0-nightly
LLVM version: 10.0

Start with the provided #[entry] example on the stm32f407g-disc1 and inspect iprintln! output through itm.stim[0]. Reproduce the fixed truncation after the 25th complete message, then identify why the remaining loop output is lost and verify that all 77 messages are captured.