Looks like it is an issue deploying to 32 bit devices (which coincidentally happened to have only those iOS versions). Apps built using Xcode 10 worked on the 32-bit machines until end of last year (so presumably there were both 32-bit and 64-bit code in the bundle). But the same bundles now uploaded again (no recompilation, just uploading the same bundle with version number change) can be installed (since it is based on iOS version supported) but will crash soon after startup on 32-bit devices.Since the Apps do start up before the crash and the crash logs indicate some execution of the startup code before they head into system libraries, the app itself has the 32 bit code even if compiled now with Xcode 10 but it looks like it might be getting deployed with some 64-bit system libraries (or missing something else) that were required to be packaged during deployment when app is installed on those machines that results in the crash.Whether this is a bug or a feature is unknown.Anyone know what is going on behind the scenes? We can only guess.