sum for array of Float16 is wrong in dims=2

[prbzrg]

maybe I don't know something but:

julia> a = ones(Float16, 3000, 3000);

julia> sum(a; dims=1)[1]
Float16(3.0e3)

julia> sum(a; dims=2)[1]
Float16(2.048e3)

julia> (a*a)[1]
Float16(2.048e3)

julia> versioninfo()
Julia Version 1.11.5
Commit 760b2e5b73 (2025-04-14 06:53 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 12 × Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, skylake)
Threads: 12 default, 2 interactive, 7 GC (on 12 virtual cores)

is this a bug?

[mbauman]

Duplicate of... one of the issues that #58418 targets. Applying sum over rows doesn't use the more numerically stable pairwise algorithm.