I have seen on the forum and this issue has been lurking around since 2018. Date Field set in email template and when Email is sent it is in YYYY-MM-DD. Although user Preference and System local is set to d/m/Y, the emails sent via workflow have the default DB format. checked system timezone for php and its set to London, which has date format as ‘d/m/Y’ so that should not be a problem too.
There is a PR for date format fix but it hasn’t been updated to merge into core for fixing the issue.