Duplicate invoice number

Several months ago I reported the same issue https://ww.wp.xz.cn/support/topic/issue-same-invoice-number/ I found some time to try it again using the default theme and without any plugins installed.

I had to make multiple and really fast clicks, multiple times to get the issue (on the orders page). I think the same could happen when the server is busy.

I could send you the login credentials of a staging environment if you want to take a look.