I think that I found a bug on Katalon v. 6.0.5
When we record new steps on an existing test step, or when we reorder the test steps in Manual editor, some steps are losing objects references causing the test to crash. We hence have to ressign all objects to tests steps affected by the bug. Thaht’s long. And annoying.
It may be related to the bug fixed on v. 6.0: " Fixed an issue on swipe command, losing objects references"
Katalon Studio v. 6.0.5 on Windows 10