In Ghidra headless, all functions have return type undefined

[ignatirabo]

In Ghidra headless (compiled from the master branch), I want to find all functions that return undefined (*) [16]. However, when I check the return type of all functions, they return /undefined of length 1 with description 'Undefined Byte'.

The thing that surprised me is that if I turn on the Decompiler Parameter ID analyzer, the types are now defined. My guess is that Decompiler Parameter ID is commiting the function signatures.

Assuming my guess is correct: how can I ensure that when I run my AbstractAnalyzer the function signatures are commited?
Or what else could be the case?

This is the function signature if I let Ghidra do it's thing:

/* DISPLAY WARNING: Type casts are NOT being printed */

undefined1 (*) [16] f(undefined1 (*param_1) [16])

{
  *param_1 = 0x0;
  return param_1;
}

Also something I noticed is that when I do have 'Decompiler Parameter ID' on, the return type of this function is not an instance of PointerDataType, neither ArrayDataType (which sounds wrong) and it has length 8, when I would assume it has length 16. Any explanation for this?

Thanks in advance.

[ignatirabo]

For the last comment I did, I realized now that I need to check whether the return type is an instance of Pointer and not PointerDataType.