when is a full toilet blackwater tank really full?

When is the drop-dead maximum blackwater fill point reached in my T@B320 2020 blackwater tank?  Can I judge visually by looking down the toilet?  What is at stake as the blackwater approaches the toilet valve?  Is the fail point the seal ring at the base of the toilet?
Yanni Lazarus 2020 T@B320S, 2018 RAV4 Adventure, Central CT

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