unexpected link behavior

[FFreestanding]

Hi, I meet a unexpected link behavior.

I have four bitcode files: a.bc, b.bc, c.bc, d.bc.
All of them had defined three structures which are listed below.

%struct.atomic_t = type { i32 }
%struct.kuid_t = type { i32 }
%struct.inode = type { i16, i16, %struct.kuid_t, /*...*/ }

Then, using llvm-link to link them

llvm-link a.bc b.bc c.bc d.bc -S -o out.ll

%struct.inode = type { i16, i16, %struct.atomic_t, /*...*/ }

%struct.kuid_t (and other structures which is defined as type { i32 }) was replaced by %struct.atomic_t in %struct.inode (or other some structures)
The incident may be caused by LTO.
I wonder how to prevent this from happening.
Thanks for your help.

[FFreestanding]

version: llvm-13