DoubleLinearExpr static methods are not available from other modules

[priamoryki]

What language and solver does this apply to?
Java / CP-SAT

Describe the problem you are trying to solve.
I've decided to use DoubleLinearExpr with a model in which I have a division and have found an interesting thing: all static methods in the LinearExpr class can be called from my module, but there is no way to use such methods from DoubleLinearExpr. As I see it, the difference is that LinearExpr is an interface, while DoubleLinearExpr is just a default class. So, the only way I can use DoubleLinearExpr is by calling a constructor, which is not convenient.
This logic doesn't seem correct to me.

Describe the solution you'd like
Adding a public modifier to all static methods in DoubleLinearExpr should resolve the problem.