Operating system: windows 10
Graphics card: geforce gtx 960
Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Short description of error
The value that represents the size of the current selected object doesn't always update automatically when you animate the object scale
Exact steps for others to reproduce the error
Create object, for example spehere and animate it to scale bigger during the whole timeline. It might be that first when you create the animation the object scale will animate also with the object scaling, but then later it stops updating and you have to move mouse around the fields to see the current size of the object.
I believe this has been an issue also in older blender versions (i didn't test tho), so it might be a very old bug.