`@bb @. mat = 0` results in integer assignment, not elementwise assignment

[RomeoV]

Describe the bug 🐞

The combination of @bb and @. doesn't work well for assignments.
In particular, this combination results in an integer assignment:

# julia 1.12
# ]add StaticArrays MaybeInplace
sarr = @SMatrix rand(6,6);
@bb @. sarr = 0
@assert sarr == 0

This causes a bug in NonlinearSolveBase.jl here when used with StaticArrays.

Expected behavior

Instead of @bb @. sarr = 0 setting sarr to the integer, it should set all values in the matrix to zero elementwise.

Minimal Reproducible Example 👇

See above.

Error & Stacktrace ⚠️

N/A

Environment (please complete the following information):

• Output of using Pkg; Pkg.status()

(jl_HoHNA6) pkg> st
Status `/tmp/jl_HoHNA6/Project.toml`
  [bb5d69b7] MaybeInplace v0.1.4
  [90137ffa] StaticArrays v1.9.16

• Output of using Pkg; Pkg.status(; mode = PKGMODE_MANIFEST)

julia> using Pkg; Pkg.status(; mode = PKGMODE_MANIFEST)
Status `/tmp/jl_HoHNA6/Manifest.toml`
  [79e6a3ab] Adapt v4.4.0
  [4fba245c] ArrayInterface v7.22.0
  [1914dd2f] MacroTools v0.5.16
  [bb5d69b7] MaybeInplace v0.1.4
  [aea7be01] PrecompileTools v1.3.3
  [21216c6a] Preferences v1.5.1
  [ae029012] Requires v1.3.1
  [90137ffa] StaticArrays v1.9.16
  [1e83bf80] StaticArraysCore v1.4.4
  [56f22d72] Artifacts v1.11.0
  [ade2ca70] Dates v1.11.0
  [8f399da3] Libdl v1.11.0
  [37e2e46d] LinearAlgebra v1.12.0
  [de0858da] Printf v1.11.0
  [9a3f8284] Random v1.11.0
  [ea8e919c] SHA v0.7.0
  [fa267f1f] TOML v1.0.3
  [cf7118a7] UUIDs v1.11.0
  [4ec0a83e] Unicode v1.11.0
  [e66e0078] CompilerSupportLibraries_jll v1.3.0+1
  [4536629a] OpenBLAS_jll v0.3.29+0
  [8e850b90] libblastrampoline_jll v5.15.0+0

• Output of versioninfo()

julia> versioninfo()
Julia Version 1.12.5
Commit 5fe89b8ddc1 (2026-02-09 16:05 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 16 × 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, tigerlake)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 16 virtual cores)