How does one fix the auto-tagging from a new project from cascading into the tag of the next action or task?
This is by design, so there isn’t anything to fix. In other words, it’s a limitation, not a bug.
It would be helpful to have a setting that determines whether or not project and group tags are automatically inherited by child actions/groups. I recommend sharing this feedback with Omni. You can reach out to them by choosing Contact Omni from the Help menu (Mac) or Settings (iPhone, iPad).
In practice, I rarely add tags to projects. The exception is projects where all/most of the actions have the same tag. For example, I have a single action list called 📦 Personal | Admin that’s tagged with “Admin,” as most of the actions I add to this project will have a tag of “Admin”. This saves me the extra effort of manually adding the tag.
On a side note, if you assign a project using Quick Entry (Mac) and don’t include the tag, the project’s tag(s) will automatically be applied to the new action. If, however, you specify tag(s) in Quick Entry, the project’s tag won’t automatically be applied.
For example, if I use Quick Entry to add an action of “Pay Visa bill” to my 📦 Personal | Admin single action list and don’t specify a tag, the “Admin” tag will be applied automatically. If I use Quick Entry to add an action of “Buy office supplies” and add a tag of “Staples”, the “Admin” tag won’t be applied.
I hope this helps!