Summary: Opening a markdown file that has YAML front matter converts the three dash demarcators into an unknown value.
Repro: Create test markdown document with YAML front matter demarcated by ---
three dashes above/below (front matter content unimportant). Open in bike, save. Demarcation indicators (three dashes) convert to unknown value.
Video Demo: Bike 1.2 (58) Issue - YAML front matter - YouTube
Version: 1.2 (58)