[WebGL] .data.unityweb is not cached in Desktop Safari

Delivering the compressed version of our WebGL build (wit$$anonymous$$n Facebook Canvas) to Safari ,Chrome and Firefox with Data Cac$$anonymous$$ng checked, that really works in Chrome and Mozilla Firefox after upgrading to Unity 2018.3.1f1.

Found a fix here:
WEBGL.DATA.UNITYWEB IS NOT CACHED IN THE INDEXED DB

However for us it looks like it fails in case of Safari Browser.Just looking for a workaround.

We are using Safari version (11.1.2).Unfortunately, it's unable to cache the "WebGL.data.unityweb" of size 47.8MB and the Asset Bundles.The large data file is downloading every time.

Does the above fix applicable for Safari also ?

What we can see in browser console is:

WebGL.wasm.code.unityweb and WebGL.wasm.framework.unityweb ate cached in browser memory but not WebGL.data.unityweb.

Getting the following errors in console (Safari Browser):

1.[UnityCache] indexedDB database could not be opened

2.[UnityCache] WebGL.wasm.framework.unityweb' successfully downloaded but not stored in the indexedDB cache due to the error: Error: indexedDB access denied

3.IndexedDB is not available. Data will not persist in cache and PlayerPrefs will not be saved.

How would we be able to find a way out?