To overcome this, set the EnsureStateIsCurrent property of the verification step to True. This will refresh the DOM tree before performing the verification and should resolve the issue you are experiencing. See this video
for a quick demonstration.
Another option is to change the role of that step. You can do that by right-clicking on the step>Change Role>Set As Wait. Test Studio will wait for that condition to be true (up to the time set) before proceeding with the test (instead of checking once and failing if false). See this article
for more information.
the Telerik team