Try to open a presentation made with 1.1 (or any older internal builds of 2.0) that has some data input in it.

This will fail like this:

Presumably because the data input syntax change (prepending $ and so) is done in a non-backwards compatible manner and now it chops off the first character without checking if it's '$'.

In the runtime we had this corrected during the review of the corresponding patch but it seems that editor is still using the wrong approach, breaking compatibility.