Mystcraft is too aggressive at making pages for mod liquids.

[keybounce]

If a mod such as twilight forest is installed alongside Mystcraft, then Mystcraft will create pages for the liquid forms of the twilight forest metals, even if there is nothing that will turn the metals into liquids.

https://youtu.be/D3nQ3NAOZsw?t=21m55s

[XCompWiz]

If the liquid exists, then Mystcraft makes a symbol for it, unless it finds that fluid on some blacklist, If you want certain fluids blacklisted/unstable by default, get me a list of resource ids for the fluid/block.

[keybounce]

The issue is less "Should it be disabled by default", and more "If there is no way to make the liquid, if it only exists because it is defined for potential mod compatibility, then should it ever generate?

I don't know enough about modding / mod compatibility / the fluid system in general to know if it is even possible to tell if a given fluid can be made or not.