Wrong objective bound in MIP with constant term

[bfpc]

Consider the model

using JuMP
m = Model();
@variable(m, x >= 0, Int);
@objective(m, Min, x + 3);

The expected result would be "3.0, 3.0", but instead we get "6.0, 3.0"

using GLPK
JuMP.set_optimizer(m, with_optimizer(GLPK.Optimizer))
JuMP.optimize!(m)
println("GLPK  : ", JuMP.objective_bound(m), " ", JuMP.objective_value(m))

To problem seems to come from adding the constant term in the function LQOI.get_objective_bound(model::Optimizer), in MOI_wrapper.jl - maybe that was needed some time ago, but not anymore, as can be seen from the results below.

using LinQuadOptInterface
const LQOI = LinQuadOptInterface;

glpk_model = m.moi_backend.optimizer.model;
LQOI.get_objective_value(glpk_model)
LQOI.get_objective_bound(glpk_model)
LQOI.get_constant_objective(glpk_model)

GLPK.mip_status(glpk_model.inner) == GLPK.OPT
GLPK.mip_obj_val(glpk_model.inner)
glpk_model.objective_bound

I tested also Gurobi.jl, which indeed returns "3.0, 3.0"