So.
It seems that a control mechanism that did not exist until recently in YunoHost, or was not enabled until now, is causing some issues with the package since version 23.11.05~ynh2, but also with previous versions starting with 23.09.28~ynh1.
To sum up, the sha256 hash in the manifest.toml was incorrect since this version, but until today it did not cause any problem. And now, it does. Like you can't install the app nor upgrade it. The file was of course updated in the repo, but the 23.11.05~ynh3 version is not yet available through the YunoHost admin interface.
Hopefully, this should be solved in a few hours when the YunoHost app catalog is updated. Of course you could do things manually, but it's probably best to wait a little.