`render --quiet` processes all .qmd in a folder

Bug description

I have 3 files in a folder: Slides.qmd Slides-old.qmd Slides-older.qmd (the last 2 I keep out of over-abundance of caution).

• quarto render Slides.qmd processes just this one as expected (makes Slides.html), BUT
• quarto render --quiet Slides.qmd processes all 3 ?!?!

Quarto check output

quarto check
Quarto 1.4.553
[>] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.11: OK
      Dart Sass version 1.69.5: OK
      Deno version 1.37.2: OK
[>] Checking versions of quarto dependencies......OK
[>] Checking Quarto installation......OK
      Version: 1.4.553
      Path: D:\scoop\apps\quarto\current\bin
      CodePage: 1252

[>] Checking tools....................OK
      TinyTeX: (not installed)
      Chromium: (not installed)

[>] Checking LaTeX....................OK
      Tex:  (not detected)

[>] Checking basic markdown render....OK

[>] Checking Python 3 installation....OK
      Version: 3.12.2
      Path: D:/scoop/apps/python/3.12.2/python.exe
      Jupyter: (None)

      Jupyter is not available in this Python installation.
      Install with py -m pip install jupyter

[>] Checking R installation...........(None)

      Unable to locate an installed version of R.
      Install R from https://cloud.r-project.org/