I have two identical custom boards with mxrt1052 installed on them together with IS25LP064a QSPI flash. When I try to debug the same project on them, one of it runs without any problem, whereas, debugging on the other one ends up with error saying "No source available ...". Actually, debug session continues, but it is trapped somewhere before reaching to main. However, suspending does not work and causes an error which ends the debug session.
Edit: When I change the source code of the project in a way that keeps the program in an infinite loop after clocks and pins are configured, the project debugs without any problem on both of the cards.