You have just uncovered a bug for us, thanks! I've created a bug report on this here. I have granted you some Telerik points for being the first to report this issue.
The good news is that it's not really important in this instance. Leaving that test step as a "Wait For" instead of "Verification" is just as useful. The difference is:
- Wait For will keep trying for up to 10 seconds and then give up, abort and fail the test
- Verification will try just one time. If the verification fails the test will immediately abort and the test will be set to Fail.
All the best,
the Telerik team