"Do I add or multiply identical effects that multiply values?"

Sage Advice has this:

Mike Mearls says "Identical effects do not stack."

Jeremy Crawford says identical non-spell effects could stack.

As far as I know this has not been resolved any further.

"Do I add or multiply identical effects that multiply values?"

Sage Advice has this:

Mike Mearls says "Identical effects do not stack."

Jeremy Crawford says identical non-spell effects could stack.

As far as I know this has not been resolved any further.