Color to Mask node question

I have a color ID mask, I'm using color to mask node to extract BnW masks from it, however the node doesn't seem to work with green color. Am I missing something? Is that an expected behavior? Couldn't find it in documentation.

Nodes and settings:

It works fine with red tho for example:

Is there a way to extract the green text? My solution for this doesn't feel like it's a good one. I've recolored it all to red and masked by luminance. Color to mask cathes edges of other shapes tho, so I've had to blur them and run through a histogram scan