It wasn't just the web export, it was also every other instance of the mobile-friendly version.
The issue was the tuning fork was only showing pulses on one side. This was a side effect of me having to modify certain systems to accommodate the additional button in the mobile control scheme.
You can see the issue recorded at around 4:05 in this video (it's how I noticed it): https://www.youtube.com/watch?v=uB4fMPxh0UQ&list=LLlRy2fVqZUXz5PPhLYczKSA&index=8&t=0s