Sometimes this helps them whitewash their screw-ups which have lead to widespread false beliefs. For example, after the UK government targetted and hit 100,000 Covid-19 tests in a day, the BBC ran an article falsely claiming Germany had achieved this a month earlier and linked it prominently on their news front page for about a month. A large proportion of the population probably saw this and now falsely believe it, it got brought up all the time as part of the narrative that the government's big "world-leading" achievements were just playing catch up badly, but it was memory-holed from the article in a rewrite and they used that as an excuse for not publishing any correction - so unless historians dig deep in third-party archives, they'd never understand where that belief came from. (Apparently a previous version of the article also wrongly claimed France was carrying out more Covid-19 tests due to mistaking their weekly numbers for daily one, according to a correction which disappeared from the article after a few days and only exists in the Internet Archive now. I haven't been able to find the original version of that claim.)