In single/full article/topic pages, the footer message (See also relevant category topics), is replaced with a markup entry. See image:
It does not break in lists pages.
I cleaned FF data cache for EnOS domain.
I verified this behavior with Gnome Web browser.
Could it be language related?
I found the problem!
Yesterday it was Tuesday 13, which, in Greece, is the equivalent of Friday 13.
Today the issue disappeared.
I will set a reminder for the next months with a Tuesday 13, to confirm this was it. 
Does it mean that, in order to confirm the bug, we should keep an eye on it when it is Friday the 13th next time where Friday the 13th is a thing? 
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