Side Navigation .sync-modifier. not working

[null-saad]

Is this a bug, enhancement, or feature request?

BUG

Briefly describe your proposal.

The .sync-modifier. is not working as expected.

Which versions of Vue.JS and Fundamental Vue are affected? (If this is a feature request, use current version.)

Vue : 2.6.11 fundamental-vue: 0.18.3

If this is a bug, please provide steps for reproducing it.

Side Navigation The .sync modifier is not working. Even in code sandbox provided.

Please provide relevant source code if applicable.

Side Navigation