Tempo changes do not recalculate durations of tied notes. Causes v.bad playback 'hanging'

[Tantacrul]

Describe the bug When specifying a tempo change on a tied note, the duration of that note does not update appropriately.

Here is a file to test: https://www.dropbox.com/s/goyazrjqr04behb/tempo%20change%20duration%20error.mscz?dl=0

In this example, the second whole note plays as if the tempo was still h=80