BBCode [size=] tag doesn't work in 2.6.4
I upgraded from 2.2.1 to 2.6.4 and solved most of the ensuing issues.
Various BBCode tags that didn't work in previous installation now started working. However, the size tag does nothing now. Well, it does something in fact, as it is not visible in the comment text. So at least it is being parsed and replaced with something, it would seem. Doesn't affect the [size=7]size[/size] [size=1]of the text though.[/size]
After examining /library/core/class.bbcode.php and /vendor/vanilla/nbbc/src/BBCodeLibrary.php I can't figure out the reason of this behavior.
The tag has been used extensively on our forum. Is there any way to fix it? I'm ready to edit core files if needed.