Yes, I get the same pain on my tibialis anterior, right leg only and just the top bit. I recently looked up the Internet to find the name for the precise muscle or tendon that aches for me, and pinpointed it to the tibialis anterior muscle. I believe the pain is also known as ‘shin splints’.
I had been using TR for over three years and the pain (or muscle/tendon strain) recently manifested itself. It usually pops up during an over/under interval where I think the transitions between really hard and backing slightly down to pretty hard provoke the problem. I’ve dropped the FTP level by a few points and swopped the over-under (threshold) rides for other types, mainly sweet spot. This helps a little but am not yet out of the woods. Complete breaks of two weeks or so do not make it go away, so I’m trying the pathway of gentler exercise levels to hopefully restore the muscle to full working order.
I’ve also started doing some tibialis anterior stretching exercises (Google it) and don’t yet know if they will help. Just sharing my current experience.