The style option in (wx)plot2d has accepted empty brackets  before to use the default style for that element. Since version 5.32 this doesn't work anymore.
This feature is very useful if you i.e. want to plot multiple functions and some point, because the different colors for the functions don't need to be set manually.
A minimal example:
This code works with version 5.31.0 but fails with 5.32.1.
The error message is:
Wrong argumet  for option style. Not a valid style.
-- an error. To debug this try: debugmode(true);
As this was working in older versions I consider this behavior a bug.
My Platform is x86-64 with Arch Linux.