[Scip] Scip interrupt status in scip 3.20

[sct]

Hi,

Just to report a new behavior in scip 3.20.

I called SCIP_CALL( SCIPinterruptSolve(scip)). After interrupting, the 
status is "SCIP_STATUS_UNKNOWN". Previously, in scip 3.1.1, it was 
"SCIP_STATUS_USERINTERRUPT". However, it was fine when ctrl-C was used 
to interrupt.