App failing when trying to register plugin on iOS build only

Trying to build and install iOS flutter project. On install I receive the following error

```
Syncing files to device STPhone (2)...
*** Assertion failure in -[FlutterDownloaderPlugin startBackgroundIsolate:], FlutterDownloaderPlugin.m:144
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'failed to set registerPlugins'
*** First throw call stack:
(0x18092bd1c 0x19814bee4 0x1820d1c80 0x1049c87f4 0x1049cd504 0x1049d075c 0x111dfcfcc 0x1118d54ac 0x1805eb094 0x1805ec094 0x180598d44 0x180598994 0x1808e70d4 0x1808a45f8 0x1808b7250 0x1a13e2988 0x1830b7a94 0x182e50fd4 0x1043b8244 0x1044cc4d0)
libc++abi: terminating with uncaught exception of type NSException
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
frame #0: 0x00000001bb1f6bbc libsystem_kernel.dylib`__pthread_kill + 8
libsystem_kernel.dylib`:
-> 0x1bb1f6bbc <+8>: b.lo 0x1bb1f6bd8 ; <+36>
0x1bb1f6bc0 <+12>: stp x29, x30, [sp, #-0x10]!
0x1bb1f6bc4 <+16>: mov x29, sp
0x1bb1f6bc8 <+20>: bl 0x1bb1f260c ; cerror_nocancel
Target 0: (Runner) stopped.
```

It's supposed to start the app, but doesn't get that far.

OS: MacOS Monterey

iPhone 8
iOS 15.6.1
plugin version 1.10.1