Number list mistake ,1.4,mobile Android

Bug graveyard
1

expected

1. 
    1.
    2.
    3.
2.

Actually，

1.
    1.
    2.
    3.
4.
2

Please resubmit this bug report and make sure that: 1) you follow the bug report template, 2) you use the default theme (no css) and 3) there are no third-party plugins enabled (You can use the sandbox vault for 2 and 3).