Should be fixed with the next update (probably this Friday)! On iOS 18.4, we currently are still suffering from the same issue that has been fixed for macOS 15.4 by the last release.
Have the same bug using the latest build (30). I have checked a couple of other builds available on TestFlight but the result was the same – the app crashes upon start.
This appears to be a new issue with the same apparent effect. Although the cause of this is not clear, yet – there are no usable error messages, it just closes – it appears to be build system/linker related. However, we could reproduce this on an iPhone here and have been able to find a workaround. There is a new build (31) out now with the workaround included.