This has been described before. @BLUEFROG recently posted that DTTG 2 is no longer under development, and that a known crash (I don’t know which one he was alluding to, and can’t find the post off-hand) would no longer be rectified. My understanding is that DTTG 2 worked on the day that 3 was introduced, and that any problems occurring now (e.g. due to incompatibility with newer iOS versions) will no longer be salvaged.
Ah, here it is, and Jim was alluding specifically to the search bug. It’s time to upgrade (that is assuming the bug persists on iOS 14.6; there was a search bug in Preview which was rectified with the update to macOS 11.4, so it’s not completely out of the question that the bug was in iOS rather than DTTG…)