BUG: Prepared statements with placeholder values .execute() not working on postgres

export const articlePreparedQueryNodePg = dbNodePg
    .select()
    .from(article)
    .where(
        sql`(${placeholder("author")} IS NULL OR ${
            article.authorName
        } = ${placeholder("author")})`
    )
    .limit(placeholder("limit"))
    .offset(placeholder("offset"))
    .prepare("article_prepared");

const articlesWithAuthor = await articlePreparedQueryNodePg.execute({
            author: "John Doe",
            limit: 10,
            offset: 0,
        });

//or
const allArticles = await articlePreparedQueryNodePg.execute({
            author: null,
            limit: 10,
            offset: 0,
        });

error: 'could not determine data type of 
parameter $1'