FontManager adds redundant span tags to body

Tell us about your environment MacOS 10.14.4

Browser and Browser Version: Chrome 79.0.3945.88

What did you do? Please explain the steps you took before you encountered the problem.

1. Use lottie.loadAnimation().
2. Span tags are added to body.
3. Destroy animation / Use another animation
4. More span tags are added to body even if the animation uses the same font.

What did you expect to happen? new span tags won't be added for an existing font.

What actually happened? Please include as much relevant detail as possible. Reloading the animation adds span tags to body without checking if the span to be added exists.

Reproduce here - https://jsfiddle.net/a129eyfL/

After 1st load

After a few more (see the duplication for Arvo font)

Thanks!