Here is a fairly simple but repeatable bug I’ve found in C13.
When using the Track Inspector to select a patch name of an external instrument, it is very useful to be able to type in a search filter (eg. “pad”)
However there seems to be a bug here that if you select another track then later come back to this track’s selection list , the filter is still applied but doesn’t show in the filter box. Thus you don’t realise that not all results are being shown.
The fix is to go into the filter box and press backspace key, even though nothing is there. Then the entire list is shown again.