Unnecessary linebreaks in GitHub Actions output

[sshine]

The stdout of my build command contains a lot of linebreaks that appear out of nowhere.

I'm not sure where they come from; I don't think they're purely misinterpreted ANSI codes.

    Downloaded clap_complete_command v0.5.1
  
     Compiling proc-macro2 v1.0.66
     Compiling unicode-ident v1.0.11
  
   
    Compiling libc v0.2.147
  
   
    Compiling autocfg v1.1.0
  
   
    
  Compiling
   
  quote
   v
  1
  .
  0
  .
  33
  
  
   
   
   
  Compiling
   
  syn
   v
  2
  .
  0
  .
  31

[sshine]

This was observed on a private repository, but I can reproduce the problem in public if this helps debugging.

I can also debug this myself, but I would like to know if anyone has a suggestion as to the reason.