Unexpected undefined references

[lassepe]

In a very simple minimal environment with only DiffEqOperators added to the Project.toml and a main.jl that only contains the following code

using DiffEqOperators: DiffEqOperators, CenteredDifference, Dirichlet0BC

Both in VSCode and nvim + coc-julia I cannot jump to the definitions of CenteredDifference and Dirchlet0BC since the definition is not found. DiffEqOperators itself, however, is found and I can use the jump feature. This happend on the current master of LanguageServer.jl with both julia 1.6.2 and 1.7.0-beta4.