Fit algorithm with MultiDomainFunction stores some workspaces in ADS even if StoreInADS=False

[RichardWaiteSTFC]

Describe the bug
Fit algorithm with MultiDomainFunction stores workspaces in ADS even if StoreInADS=False

To Reproduce
(1) Run this script

from mantid.simpleapi import *
from mantid.api import MultiDomainFunction, FunctionFactory
from mantid.fitfunctions import FunctionWrapper
                          

comp_func = CompositeFunction(Gaussian(Height=1, Sigma=0.3, PeakCentre=3), FunctionWrapper("FlatBackground"), NumDeriv=True)
ws = CreateSampleWorkspace(OutputWorkspace='ws', Function='User Defined', UserDefinedFunction=str(comp_func), XUnit='DeltaE', 
                           XMax=7, BinWidth=0.1, NumBanks=1, BankPixelWidth=2)

func = MultiDomainFunction()        
md_fit_kwargs = {}
for ispec in range(ws.getNumberHistograms()):
    func.add(comp_func.function)
    func.setDomainIndex(ispec,ispec)
    key_suffix = f"_{ispec}" if ispec > 0 else ""
    md_fit_kwargs["InputWorkspace" + key_suffix] = ws.name()
    md_fit_kwargs["StartX" + key_suffix] = 0.1
    md_fit_kwargs["EndX" + key_suffix] = 6.8
    md_fit_kwargs["WorkspaceIndex" + key_suffix] = ispec


out = Fit(Function=str(func), Output='ws', StoreInADS=False, CreateOutput=True, OutputCompositeMembers=True,
          **md_fit_kwargs)

(2) For StoreInADS=False get this

(3) For StoreInADS=True get this

Expected behavior
Would not have workspaces ws_Wortkspace_0 etc. in ADS when StoreInADS=False