The investment becomes worthless in the year that you are certain none of it will be returned to you. This can be tricky to figure if there are lawyers involved and lawsuits to try and recover damages from the assets of the company. You declare it as worthless in the year that all that legal action is complete if there is any going on.
If there isn't any legal recovery attempt for you then your investment became worthless in either 2019 or 2020 and you should amend the return for that year.
@miernikcx
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