Something similar happened in Australia last year.

Federal Government ministers all have their phone bill summaries released as part of public record with private information removed.

https://www.sbs.com.au/news/how-hundreds-of-parliamentary-mo...

The contractor redacted the phone numbers in this instance by changing the font colour to white (same as the background) in the PDFs uploaded to the government disclosure website. So if you exported to text, or highlighted text, the phone numbers were clearly visible.

So most federal members of parliament, the former prime minister (Australia's equivalent of president) and opposition leader all had their numbers leaked.