`doubleClickZoom` handler method `isActive` does not return `true` as expected

**mapbox-gl-js version**: main

**browser**: any

While `doubleClickZoom` works as expected, `doubleClickZoom.isActive()` does not return `true` when it is expected to. This behavior can be reproduced by setting up a zoom event listener and calling `doubleClickZoom.isActive()`.

### Expected Behavior
`doubleClickZoom.isActive()` returns true when double click zoom is in progress

### Actual Behavior
`doubleClickZoom.isActive()` returns false

Reproduce the issue by setting up a zoom event listener and calling the doubleClickZoom.isActive() entry point. Trace the doubleClickZoom handler while double-click zoom is in progress, then verify that isActive() returns true during that period and remains false otherwise.

Written by the indexing model from the issue text.