Merge bitcoin/bitcoin#34646: Fix two issues in p2p_private_broadcast.py #3217

Job	Run time
[meta] record frozen commit	9s
[meta] determine runners	4s
matrix.job-name	0s
matrix.job-name	0s
test ancestor commits	0s
lint	0s
matrix.name	0s
Windows, ${{ matrix.crt }}, test cross-built	0s
Windows-cross to x86_64, ${{ matrix.crt }}	0s
	13s

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