Relative tempo change not correct

Tempo=X | mosso
If a section with Tempo=X is followed by a “Mosso”, the tempo is changed as a percentage to the X (okay).

Tempo=X … rit. | mosso
But if a ritardando is before the “Mosso”, the tempo is changed as a percentage to the changed tempo according to “rit.” and not relative to the X.

Yes, I’m afraid this is a known limitation and it’s something that we plan to fix in a future version. Sorry for the inconvenience in the meantime.

Thank you for the answer.
It’s nice to hear that it’s coming soon.