@Subfader: Please provide a list of steps to reproduce, step by step, so someone else could try to reproduce the problem, plus "actual outcome" and "expected outcome".
See https://www.mediawiki.org/wiki/How_to_report_a_bug for more information. Thanks!

Your pasted text block replies are of less help than my bug reports ;)

In T145276#2626285, @Subfader wrote:

Your pasted text block replies are of less help than my bug reports ;)

If no one knows your exact steps to reproduce and which steps to perform to insert new lines, way less people will be able to reproduce the problem and hence it will be more likely that your bug reports will get closed as declined. Up to you. :)

Fixed: https://www.mediawiki.org/w/index.php?title=Extension%3ACharInsert&type=revision&diff=2239365&oldid=2235689

This ticket can be closed.