Actually, digging into this, it appears not to be a 2026 issue. I tested in 2025 and it did the same thing.

... the issue would happen if you generate tracks, and then disable the style. The old tracks are still there. To solve that, Save the file with the style disabled and reload it. That fixes it. If the disable style is done before you generate a style, the issue doesn’t occur. This has been the case for many years, but we will look into it.

Thank you!
Catherine