Only one build at a time working on device

Hello,
i am sure the answer is simple, but i just don't know where to start searching:
When I build a Project and its uploaded to my device (Ipad pro), it works fine - till I build another project and upload it, then the first one stops working. The former app opens - fullscreen blue/gray for a moment, and then crash back to homescreen..

I assume it has something to do with premissions? The bundle identifier differs for each project, and in the developer settings of the device only the...

Only one build at a time working on device