Snakemake version
9.11.2

Describe the bug
When attempting to pass an unwrapped function to params, I receive a

TypeError: '<function ...>' is not a callable object

Even when the function is callable.

The expected outcome is the error

unpack() is not allowed with params. 

Minimal example

getparams = lambda wildcard, output: {"key": {output}}
rule paramsdictfail1:
    output: "out.txt"
    params: unpack(getparams)
    shell: "echo '{params}' | tee out.txt"