Beside the performance issue, this can be an issue if you check in the condition a precondition for the rendering (e.g. if an object exists), and in the rendering part you depend on this check (e.g. access properties of this object).
E.g. let post: Post | undefined
Check in the condition if post !== undefined
Render post.title if the condition is true
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Beside the performance issue, this can be an issue if you check in the condition a precondition for the rendering (e.g. if an object exists), and in the rendering part you depend on this check (e.g. access properties of this object).
E.g.
let post: Post | undefinedCheck in the condition if
post !== undefinedRender
post.titleif the condition is true