PBC fix bundle #2050

Job	Run time
macos-latest: clang++ Release Threads	12m 59s
macos-latest: clang++ Release OneTBB	1m 26s
macos-latest: clang++ Release PaRSEC	1m 34s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	1m 1s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	1m 2s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	1m 27s
macos-latest: clang++ Debug Threads	21m 12s
macos-latest: clang++ Debug OneTBB	1m 21s
macos-latest: clang++ Debug PaRSEC	1m 43s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	1m 10s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	1m 2s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	1m 14s
	47m 11s

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