Per (1) I would report the Robin Hood undetermined term IRS form 1099-B as all short-term or all long-term.
If the tax return is virtually complete, you should be able to determine the difference, if any, by trying both ways.
First, select ST, run Review and view the tax return, then select LT, run Review and view the tax return.
Per (2) I would not ignore the Robin Hood IRS form 1099-B since it has been reported to the IRS.
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