Toast animations do not work when multiple toasts are supposed to be animating

Environment

• Package version(s): 3.38.2
• Operating System: macOS 10.15
• Browser name and version: Chrome 88.0.4324.96 (Official Build) (x86_64)

Code Sandbox

Link to a minimal repro: https://blueprintjs.com/docs/#core/components/toast

Steps to reproduce

• Click any of the toast creation buttons in quick succession
• OR set a low maximum and try to create a new toast once reaching the maximum
• OR create a bunch of toasts and then clear() them all at once

Actual behavior

Only the newest/topmost (toast[0]) toast will actually animate, the rest will just instantly snap to their final state.

Expected behavior

All of the toasts will go through their full enter/exit animations.

Possible solution

Not a React guy but the common thread with this bug seems to be that only one animation will play at a time and when multiple animations should be playing only the toast at index 0 actually animates.