PBC fix bundle #2041

Job	Run time
macos-latest: clang++ Release Threads	11m 28s
macos-latest: clang++ Release OneTBB	1m 7s
macos-latest: clang++ Release PaRSEC	1m 12s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	34m 49s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	1m 26s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	1m 1s
macos-latest: clang++ Debug Threads	18m 26s
macos-latest: clang++ Debug OneTBB	1m 9s
macos-latest: clang++ Debug PaRSEC	1m 26s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	48m 47s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	1m 41s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	1m 56s
	2h 4m 28s

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