when upgrading / downgrading different packages it can lead to a combination, where some activities will not get resolved anymore.
Also we would recommend to reference preview packages carefully.
To step out of such a combination conflict we recommend:
decide the main level - e.g. 22.X / 23.X
then check the referenced constraints by the additional packages (Mail, Excel…) against the Platform / UiPath.System.Activities and base line it to the best fit combinations
reference all needed packages with the specified version
remodel remaining unresolved activities, when it is occurring