short date is not sent through to app in playinlinux

I had Ubuntu 20.04 installed and was using MYOB in Playonlinux to do my accounting and it all ran fine. I had a number of issues in Ubuntu (screens and stability mostly) and when it refused to boot one day and Ubuntu 20.04.1 had just been released, I decided to install it instead. Fixed all my Ubuntu issues, but then had some weird issues in MYOB. The main one is that the date format is MM/d/yy, where in Australia it should be dd/MM/yy. I researched MYOB (this in MYOB 19) and found it gets the date format from the Windows short date.

Looking into the date format in wine, I went into the registry setting (see answer at https://askubuntu.com/questions/474900/change-date-format-for-wine-windows-software) for short date, but it was set correctly (not sure, but this may come from Ubuntu?), so it seems that is not being sent through. I tried different versions of Wine, but in the end did a total reinstall of Ubuntu and still had the same issue. So not sure if this is something that changed in Ubuntu 20.04 > 20.04.1 or if its a different version of playinlinux and the one in 20.04.1 repository (used the default one in the repo) has a bug or if its something to do with Wine.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: playonlinux 4.3.4-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Aug 25 20:42:05 2020
InstallationDate: Installed on 2020-08-25 (0 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_AU:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: playonlinux
UpgradeStatus: No upgrade log present (probably fresh install)