Some characters aren't rendered in export PDFs

[BenitoMatischen]

Known characters not rendered as expected in the export PDF:
🔄, 🔗, 📄, ▶️, ' ' (\t), '🔥' (\U0001f525), '💡' (\U0001f4a1), '🧠' (\U0001f9e0), '🐶' (\U0001f436), '📖' (\U0001f4d6), '🧘' (\U0001f9d8), '👊' (\U0001f44a), '📚' (\U0001f4da), '🪙' (\U0001fa99)