Please don't update the dates manually, for various reasons:

• replacing the old version means losing the old versions are lost;
• the version is updated in a centralized way; see for example: https://commits.kde.org/okular/3d148bd57053460bea8bca29a87e97c3f1266481/ or https://commits.kde.org/gwenview/0ccc0c2fc00176da9064999f997654c9e1624ef5
• the date is incorrect; 2020-05-11 is the tagging date, the release date is 2020-05-14.

Oh, I am sorry, was not aware that this was now automated. For the previous releases, I frequently forgot to update the AppData version which caused was problematic for packagers. Last time I tried, setting a version date in the future triggered an error in appstream validation, which is why I set it to the incorrect date - was always better than forgetting to update the version.

Great to know that I won't have to take care of this anymore and sorry for this.