PBC fix bundle #2035

Job	Run time
macos-latest: clang++ Release Threads	12m 6s
macos-latest: clang++ Release OneTBB	1m 18s
macos-latest: clang++ Release PaRSEC	1m 37s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	36m 21s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 1s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	2m 9s
macos-latest: clang++ Debug Threads	18m 24s
macos-latest: clang++ Debug OneTBB	1m 24s
macos-latest: clang++ Debug PaRSEC	1m 36s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	48m 29s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	1m 35s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	1m 49s
	2h 8m 49s

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