Actually, I might have been wrong in my previous replies.
Just met the problem again:
The top element in the component is a simple div - no fancy things there.
As the fix, I decided to regenerate the plasmic component’s code again (along with the skeleton - I had to manually remove it, in order to have it regenerated). This caused the following change in my files:
And it fixed the problem.
So, the problem seem to happen if you rename the top element of your component, after its’ skeleton code had already been generated.
As a fix, regenerate the component skeleton code.