Yes, it includes an attempt at a fix. We've seen this problem occur when an expression in a text object uses OBJECT_EMPTY (directly or indirectly) to refer back to the same object, or to refer back to another object in the same chain of linked objects. Reentrancy causes a problem in the registration of variables.
If you're not using OBJECT_EMPTY in any expression (anywhere, not necessarily in the object that exhibits the problem), it may be possible that something else is causing reentrancy. In that case the problem is still likely to be fixed in 7.0.2. I can't confirm it yet, I'll examine your *.psmd files and see if I can detect a pattern.
Thanks,
Sander