Fade-in weirdness

Anyone else seen this fade-in behaviour? The two clips were identical before I applied a fade-in to the first part of the first clip. It reduced the waveform of the whole clip. This is only a display problem. It sounds fine, and bouncing the clip fixes the problem. This doesn't happen in all projects.
 

I realised after sending this at something past midnight that i'd been here before. It's caused by tempo changes. The fade restarts at every tempo change. It's a known and acknowledged bug. Quite disconcerting in a project with lots of tempo changes.

Just for fun, try it. Open a new project, import a fragment of wav file, insert a tempo change halfway along, then add a fade in. You should get a fake fade at the tempo change.