weird behaviour with multiline comments

[dpinol]

Formatting this with default configuration of 2.1.6

function f()
    #==Pairs Tuple or ValidationResult==#
    #=
    So far
    =#
end

we get

#=
So far
=#
function f()
    #==Pairs Tuple or ValidationResult==#

    #=
    So far
    =#
end

Then, at each consecutive formatting the 3 first times are replicated again and again