chrome: 70.0.3503.0 (Official Build) canary (64-bit) (cohort: Clang-64)
Chrome: 69.0.3497.12 (Official Build) dev (64-bit) (cohort: Dev)
NVDA: 2018.2.1
JAWS: 2018

Steps to repro:
# With JAWS running, visit: https://minorninth.github.io/aria-live-region-tests/live_region_tests.html
# Click on the 'change img alt text' button under the second heading

Expected: JAWS should announce the changed alt text
NVDA: works as expected

Actual: JAWS does not announce the change.