simplify fails on "-sin(x)^2 - cos(x)^2"

[Azercoco]

Test code :

using Symbolics

@variables x::Real

println(simplify(sin(x)^2 + cos(x)^2))
println(simplify(-sin(x)^2 - cos(x)^2))

Output :

1       
-(sin(x)^2) - (cos(x)^2)

Expected :

1
-1