Incorrect type inference of variables from indexing

[wheeheee]

Perhaps some part of the logic erroneously assumes that indexing must always produce an element?
The inlay hint and the subsequent "Possible method call error" shows that the LS does not know that M[:, L] is a Vector{T}.
Both the hint and the blue squigglies go away if I remove the where T....
Doesn't need to be a Matrix, a Vector works too.

function foobar(M::Matrix{T}) where T<:Number
    L = size(M, 2)
    x = M[:, L]
    xn = similar(x)
end

Screenshot below shows the inlay hint and the "possible method call error"