Tried 2 times, both time the issue occurred.
Not *major* but not normal, so reporting as a bug.
production site www.socouture.fr
clone of production site w3.socouture.fr on 220.127.116.11(edited typo, confirm version is 3.0.19.
it doesnt seem to cause any mess on the frontend...
let me know if this report requires any more information, or someone wants backend admin access to check it out for themselves.