Thanks for reporting. Fixed in https://github.com/NodeBB/NodeBB/commit/9170ee831aefddc2ec4ddeff69098fb7ec6e07a4
Tags don't like ampersands etc.
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@psychobunny Applied fix, 86% solved.
URL is now
q&a
. Assuming because&
gets run through the next line in your fix, which removes the;
.