Q: ibooks.js audio playback doesn't work with <spine page-progression-direction="rtl">

Hi

We're developing some user interactive epub with ibooks.js .

out epubs features are :

* embeded audio playback

* animation which is triggerd by user interaction

we found an issue on audio playback on ibooks.js

when we try to play audio with ibooks.js on å&#143;³é&#150;&#139;ã&#129;&#141; ( page-progression-direction="rtl", right-to-left ) html,

It doesn't work.

is this a bug of ibooks.js ?