I checked vB 5.2.3 and it doesn't add <vb:literal> tags. So I think the addition of literal tags started in vB 5.2.4.
I still think that this was intended for vBCloud only. This should not happen in self-hosted version. Actually, the Ad code field has this text above it:
Quote:
Template conditionals and variables are allowed.
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That should be removed if template code syntax is not allowed.