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Calls to MouseTracker.isAnnotationAttached must be removed.
This feature is no longer technically possible,
since annotations are no longer tracked.
If you somehow need this feature, please submit an issue.

Timeline

Landed in version: 1.15.4
In stable release: 1.17

References

API documentation:

MouseRegion

MouseTracker

MouseTrackerAnnotation

RenderMouseRegion

Relevant PRs:

MouseTracker no longer requires annotations attached,
which made the change

Improve MouseTracker lifecycle: Move checks to post-frame,
which first introduced the mounted-exit change,
explained at The change to onExit.