TitleButtons*: known bug or not?

So, I noticed while hacking together a theme for myself that
icewm seems really unhappy with title buttons that appear on
both the left and the right.

This works fine:
  TitleButtonsSupported="xmirs"
  TitleButtonsLeft="sxim"
  TitleButtonsRight="r"

This totally screws up the the window's title bar:
  TitleButtonsSupported="xmirs"
  TitleButtonsLeft="sximr"
  TitleButtonsRight="r"

Is this a known bug? I'd love to be able to include some buttons on
both sides. 

Elijah

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