HTML5: Game time / animations speed up after repeated tab switching (3.x, worked in 2.4.x)

[arungowda09]

Creator version: 3.8.3
Platform: Web / Browser (Chrome, Edge)
Regression: Yes (worked in 2.4.12)

Issue:
After repeatedly switching browser tabs (hide → show), the entire game gradually speeds up.
This affects:
Tweens
Click animations
UI feedback
Any animation using engine time
This is not limited to a specific tween or script. Even unrelated animations (e.g. clicking another piece) appear faster after several tab switches.

What I tried:
director.pause() / director.resume() on EVENT_HIDE / EVENT_SHOW
Restarting tweens
setTimeScale(1)
FPS locking
Refactoring animations
None of these prevent the speed-up.

Expected behavior:
Game timing should remain consistent after tab switching (same as 2.4.x behavior).

Actual behavior:
Engine time appears to accelerate after each tab switch.

Notes:
This did not happen in Cocos Creator 2.4.12 with the same logic.
Is this a known limitation or a regression in the Web scheduler / tween timing in 3.x?