I haven't find it in v4 documentation and all input checkboxes and radio doen't have the autocomplete attribute but as mentioned in v3 :
https://getbootstrap.com/docs/3.4/javascript/#callout-buttons-ff-autocomplete firefox persist state during browsing https://bugzilla.mozilla.org/show_bug.cgi?id=654072

So maybe need to add autocomplete="off" on all radio and checkboxes in V4/V5 documentation + put back the callout?