If you receive the right to payment from an estate during the Chapter 13 plan, and the bankruptcy trustee
finds out, then the trustee can ask the court to reopen and modify the plan based upon changed financial circumstances. See Matter of Lybrook (7th Cir. 1991) 951 F.2d 136, 137; Matter of Tworek (BC D NE 1989) 107 B.R. 666, 667.
I had a customer who was a debtor recently who claimed that the bankruptcy trustee advised him differently. The customer claimed that a California bankruptcy judge has stated that only inheritance received within 180 days will be retained by the trustee. I asked the customer to get a citation for the ruling, because I could not find any supporting decision in the appellate courts.
He could not get the trustee to produce the citiation.
My comment then, and now, is that the trustee is your adversary and he/she will tell you whatever will benefit the bankruptcy estate -- even if it means flat lying about your liabilities. So, be careful what you hear, because there's a load of BS floating around.
Also, it's your attorney's obligation to advise you -- so, don't be afraid to demand an answer to an important question (though I understand that you may not have the money to pay the attorney's hourly rate -- or the attorney may be reluctant to contact you, because he/she knows you can't afford to pay).
Hope this helps.