Saving PDFs with buffered writer leads to corruption

[treigerm]

Saving PDFs with the snippet

with outfile.open("wb") as f:
    plt.savefig(f, dpi=300)

leads to corrupted PDFs. The code executes perfectly fine but the files cannot be opened (see below for error when trying to open the file with Preview on Mac OS 15.4.1).

Using the approach

plt.savefig(outfile, dpi=300)

leads to uncorrupted files.