ogg123: feeding FLAC file via STDIN fails

Hi,

I tried to feed ogg123 with an FLAC file via STDIN, but ogg123 is telling me it's corrupt.

> ogg123 - < HD_2020-01-30_465376506.flac

Audio Device:   Advanced Linux Sound Architecture (ALSA) output

Error opening - using the oggvorbis module.  The file may be corrupted.

> cat HD_2020-01-30_465376506.flac | ogg123 -

Audio Device:   Advanced Linux Sound Architecture (ALSA) output

Error opening - using the oggvorbis module.  The file may be corrupted.

If I give the FLAC file as a normal input it is working:

ogg123 HD_2020-01-30_465376506.flac 

Audio Device:   Advanced Linux Sound Architecture (ALSA) output

Playing: HD_2020-01-30_465376506.flac
FLAC stream: 16 bits, 2 channel, 44100 Hz
Artist: Flamingo Pier
Encoded by: **removed**
Heardis_id: HD_2020-01-30_465376506
Title: Boogie Meltdown
ReplayGain (Track): -6.27 dB
ReplayGain Peak (Track): 0.986664
                                                                            
Done.

I tried it on Ubuntu 20.04 (vorbis-tools 1.4.0-11) and Ubuntu 18.04 (vorbis-tools 1.4.0-10.1) and both gave me the same error.

Is this a bug or just not possible with FLAC files?

thanks in advance :)