The following seems to not work (original).
It’s worth noting that it’s possible to trigger an ordered list by accident, by writing something like this:
1986. What a great season.
In other words, a number-period-space sequence at the beginning of a line. To avoid this, you can backslash-escape the period:
1986\. What a great season.
For example it converts 20\. to 20. and then 20. to 1., effectively making it a list, which is not what is intended.
I'm running latest versions of the plugin and WordPress.