Process Error message with a fresh process model

Existing process models started showing error messages when saving without changes. I created a new process model with just the default start and end nodes and it still produces an error message on save: "Error: Non-nullable input ACP(s) for unattended nodes(s) must not be null: isAsynchronous". Does anyone have insight on a root cause or how to address this issue?

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  • This message happens with all new process models I try to create. Existing processes don't have this error, but other errors occur.

    For example, if I hit save on a process with a "Send E-mail" activity without making any changes, the from and to data gets wiped out and I'm prompted to that they cannot be null.

    Additionally, I start receiving errors messages about the End Node:

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