Situation
The cy.type() Tabbing notes state that
Typing tab key does not work
In the meantime, you can use the experimental cypress-plugin-tab and can thumbs up this issue.
The documentation on how to test the Tab key within Cypress in 14.3.0 can be found in the cy.press() documentation here: https://docs.cypress.io/api/commands/press
This problem was reported by a user in Discord.
Suggestion
Update the cy.type() Tabbing notes to explain that cy.press() can be used.