I am wondering now if Jekyll is really doing this conversion, if you are not sharing enough code to understand the problem, or perhaps it has to do with I am running a newer version of Jekyll? Or is it that I am missing something really simple, which could be the case?
Thanks so much for checking! I’d spend so much time narrowing the error down to my Jekyll setup that I forgot to check if it perhaps was indeed my setup and not Jekyll itself. Turns out that most likely the ext-links filter plugin is to blame!