S5411 FP when instanceOf is used on Boxed variable

The reply on Jun 9 indicated this was a duplicate of S5411 FP after doing a null check

I now using version 8.0 of SonarLint and the 91513 issue, of which this was marked as a duplicate, seems fixed but this one is NOT fixed in 8.0. So I think SONARJAVA-S5411 fixed when explicitly checking for a null but not when doing an ‘instanceOf’. Please address. Thanks