Compatibility with Collapsiblock

Issue Summary

I am using Collapsiblock with the Wabi theme and it almost works. The glitch relates to the icon next to the block that can collapse or expand. For some reason, this icon always stays as the "expanded" arrow. And the icon drops with the content of the block, when it should remain next to the block title. I'm not sure why it's doing this. Any suggestions would be appreciated. I've attached a screenshot. Thank you in advance!