Heading is overlapping the Contents box from the Simple Page Template on small screen, if there is a large heading in the Contents box

When in the Contents box, one of the sub-paragraphs headings from the page content reaches a larger number of characters, in this case 65 characters:

Sub-sub paragraph Sub-sub paragraph Sub-sub paragraph Sub-sub par

Currently I only tested with a Simple Page template, but I also noticed that the Article, Encyclopedia, Meeting notes page templates include the Contents box and I suspect it could reproduce with those page types as well.