A 401(k) plan allows participants to convert their after-tax contributions to Roth via an in-plan Roth conversion feature. After a conversion, are those dollars completely recharacterized as Roth such that they would no longer be eligible for a penalty-free early withdrawal? For example, if a 50 year old participant had $7,000 in after-tax contributions, he would be able to withdraw them at any time without an early withdrawal penalty. If he converts them to Roth via the in-plan conversion, would he lose that ability to withdraw the funds before age 59.5?