Question:
Does 2 Peter 2:20-22 mean that those who are saved will lose some crowns but will still go to heaven?

Answer:
2 Peter 2:20-22 says: “For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning. For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them. But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.”

                                                                                      

The answer is No. They are the same as those in Hebrews 6:4-6. One that is exposed to the truth is more responsible than those who have not heard. For them, it would have been better not to have heard the truth of God. True believers are called sheep and they might fall into sin, but they don’t wallow in it like a pig. Read Hebrews 10:38, 39 for these verses show the difference between the true and false, between the mere professor and the believer.
Notice what Hebrews 10:26 says: “For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins.” The word “sin” in this verse means to “miss the mark” which is Christ. If I turn away from Christ, what sacrifice do I have for sin? None! After a person has the knowledge of how to be saved and he willfully turns away from the truth, there is no other means of being saved.