Setting a font does not persist to new page

[bricka]

Bug Report

Description of the problem

When I set a font (in this case, Helvetica-Bold), the font is not retained after a new page is created. This makes it very difficult to write a lot of text at once.

Code sample

https://github.com/bricka/pdfkit-font-new-page-reproduction

const fs = require('fs');
const PDFDocument = require('pdfkit');

const doc = new PDFDocument({ font: 'Helvetica' });

doc.pipe(fs.createWriteStream('test.pdf'));

doc.font('Helvetica-Bold');

doc.text('Text on first page');

doc.addPage();

doc.text('Text on second page: should be bold');

doc.end();

Your environment

• pdfkit version: 0.19.1
• Node version: 26.2.0
• Browser version (if applicable): N/A
• Operating System: Arch Linux

[bricka]

I think there's a chance this may be related to #922, but I'm not certain.

[bricka]

Interestingly, if I don't set a default font in the constructor, the bold is indeed persisted to the second page.