2.6.37 draws stack sizes over 99 twice

[ThexXTURBOXx]

Due to a bug in #528, stack sizes of 100 and higher are now rendered twice, as seen in the screenshot below (illustrated through items from an AE2 network).
The bug ocurrs starting in 2.6.37-pre and was not present in 2.6.36.

Edit: I am using NEI-GTNH in Agrarian Skies 2.

[kend1e]

I think this is due to changing the render scale of large stacks in GuiContainerManager in the drawItem method. This should work fine, but for some reason it doesn't disable the original renderer

                if (itemstack.stackSize > 1) {
                    stackSize = ReadableNumberConverter.INSTANCE.toWideReadableForm(itemstack.stackSize);

                    if (stackSize.length() == 3) {
                        scale = 0.8f;
                    } else if (stackSize.length() == 4) {
                        scale = 0.6f;
                    } else if (stackSize.length() > 4) {
                        scale = 0.5f;
                    }

                } else {
                    stackSize = "";
                }
            }