Play button on timelines causes playhead to go back to beginning every time

I am having the same issue -- timeline starts playing from the beginning no matter where I click the blue starting line index in slides with layers (and who's base timeline is shorter than the slide layer, but not sure if that second part is a requirement to reproduce). I can play through the entire timeline without issue but it won't let me start where I want to and this is incredibly inefficient when developing timings. Please fix this, it massively reduces my effectiveness and means I'm spending way more time building training, which is entirely the problem that a tool like Storyline is designed to fix.