The chastenment of Hebrews chapter 12 deals about our life, not beyond after our death. It tells us, if there is no chasten upon a person, then a person is not true saved in the first place - vs. 8.
In fact, many of us who were not saved yet, we do not feel chasten comes from God, because we do not feel guilty, or having fear. Because, the Holy Spirit is not yet dwell in us till, we hear the gospel of Jesus Christ, then repent and accept Christ. Then, Holy Spirit starts to working in us, will cause us feel guilty and having real fear from God. Will face problems and temptations. Once a person received Christ, will be immediately into spiritual warfare. Christ is dealing with a person who already hear the gospel, believed, repent, and received, to discipline with a person. Discipling a person of Hebrews chapter 12 deals about our lifetime, not beyond after our death.
Remember, Hebrews 10:27 tells us, ONCE for all people to die AFTER this judgment. That means, once a person die with repent or without repent, already face the conclusion, there is no promise for being released from it. That's it. 2 Cor. 6:2 tells us, it is right now - today of salvation, we must making decision, and repent of our sins daily, or if we stopped repent, and believing Christ, remain in sins without repent by the all the way till our death, then once after we die, it will be too late for us to have another chance to repent of sins.
I never see find anywhere in the Bible saying a lazy servant shall be released out of the outer darkness beyond.
Obivously, the outer darkness is hell, that place shall be cast into the lake of fire shall be an eternality place.
Also, there is none verse anywhere in the Bible saying that an outer darkness is a temporary. No way, that you can find a verse in the Bible to prove that an outer darkness is a temporary. Many Christians understand 'outer darkness' is an obivously speak of eternality punishment. No way, that you would deny 'outer darkness' is an eternality place, because of Christ saying so.
In Christ
Rev. 22:20 -Amen!