Protect breakpoint persistence from print-* vars (#792) #580

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 5s
test (ubuntu-latest, 28.2, false)	1m 15s
test (ubuntu-latest, 29.3, false)	1m 12s
test (macos-latest, 28.2, false)	1m 45s
test (macos-latest, 29.3, false)	1m 53s
test (windows-latest, 27.2, false)	1m 35s
test (windows-latest, 28.2, false)	1m 58s
test (windows-latest, 29.3, false)	1m 55s
test (ubuntu-latest, snapshot, true)	54s
test (macos-latest, snapshot, true)	1m 36s
test (windows-latest, snapshot, true)	1m 31s
	16m 39s

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