Stacks 2.7.2 problem

After the update to Stacks 2.7.2 I had an issue opening the “Stack Elements”.
If I open one or more developer section, it became impossible to close it.
The little grey arrow is “off” but the stacks inside remain visible.
Stacks 2.7.2 issue
I downgraded to Stacks 2.7.1 and the issue disappeared.