If you go to https://fonts.google.com/specimen/Libre+Baskerville?preview.text=T%C5%8Dky%C5%8D and then try to edit the text you'll see that the macron is not actually placed over the letter: <img width="762" height="1192" alt="Image" src="https://github.com/user-attachments/assets/43c440c6-67da-4c5f-b63e-820e20e4e81e" />
If you go to https://fonts.google.com/specimen/Libre+Baskerville?preview.text=T%C5%8Dky%C5%8D and then try to edit the text you'll see that the macron is not actually placed over the letter: