NestedBlockState: fix bfield influence for higher levels

This fixes issue #662
3 jobs for master in 376 minutes and 31 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed job_clang_amd64 #4676
amd64

04:51:41

passed job_gcc_amd64 #4669
amd64

01:24:49

failed job_clang_amd64 #4670
amd64

02:53:48