Xcode 11.1 won't start (quit unexpectedly using the libMainThreadChecker.dylib plug-in)

The title basically says it all. I've been trying to use the Unreal Engine Editor on my Mid 2014 15-inch MacBook Pro Retina running Big Sur 11.1 Beta, and after having trouble and then learning that the latest version of Unreal (4.26) was built with Xcode 11.1, I decided to try that version. I've downloaded it from the Apple Developer site, but whenever I open it I get an error that "Xcode quit unexpectedly while using the libMainThreadChecker.dylib plug-in."

I've gone through a lot of trouble to ensure that all my files have been removed from the Application Support in addition to clearing out all other Xcod installations, and have even re-decompressed the .xip file to try again, but still it doesn't work. I would post the full problem details, but they're incredible long, so here's just one part that seems relevant (although I'm not really sure):

Code Block
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libMainThreadChecker.dylib 0x0000000119d92dc4 addSwizzler + 251
1 libMainThreadChecker.dylib 0x0000000119d926e8 library_initializer + 3012
2 dyld 0x000000010c16adf5 ImageLoaderMachO::doImageInit(ImageLoader::LinkContext const&) + 321
3 dyld 0x000000010c16b46d ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) + 29
4 dyld 0x000000010c165d1a ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, char const*, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 492
5 dyld 0x000000010c163b82 ImageLoader::processInitializers(ImageLoader::LinkContext const&, unsigned int, ImageLoader::InitializerTimingList&, ImageLoader::UninitedUpwards&) + 188
6 dyld 0x000000010c163c22 ImageLoader::runInitializers(ImageLoader::LinkContext const&, ImageLoader::InitializerTimingList&) + 82
7 dyld 0x000000010c1546a2 dyld::runInitializers(ImageLoader*) + 82
8 dyld 0x000000010c15f569 dlopen_internal + 609
9 libdyld.dylib 0x00007fff203fdfc0 dlopen_internal(char const*, int, void*) + 177
10 libdyld.dylib 0x00007fff203ec86e dlopen + 28
11 com.apple.dt.IDEFoundation 0x000000010c63bfca _IDEInitializeMainThreadChecker + 405
12 com.apple.dt.IDEFoundation 0x000000010c63c8f2 IDEInitialize + 1253
13 com.apple.dt.IDEKit 0x000000010d635d47 -[IDEApplicationController applicationWillFinishLaunching:] + 622
14 com.apple.CoreFoundation 0x00007fff204cefec CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER + 12
15 com.apple.CoreFoundation 0x00007fff2056a89b _CFXRegistrationPost_block_invoke + 49
16 com.apple.CoreFoundation 0x00007fff2056a80f _CFXRegistrationPost + 454
17 com.apple.CoreFoundation 0x00007fff2049fbde _CFXNotificationPost + 723
18 com.apple.Foundation 0x00007fff2120dabe -[NSNotificationCenter postNotificationName:object:userInfo:] + 59
19 com.apple.dt.DVTFoundation 0x000000010b75037d -[NSNotificationCenter(DVTNSNotificationCenterAdditions_MRR) _dvt_postNotificationName:object:userInfo:] + 177
20 com.apple.AppKit 0x00007fff22cded30 -[NSApplication finishLaunching] + 326
21 com.apple.dt.DVTKit 0x000000010c27be38 -[DVTApplication finishLaunching] + 293
22 com.apple.AppKit 0x00007fff22cde939 -[NSApplication run] + 250
23 com.apple.AppKit 0x00007fff22cb2d92 NSApplicationMain + 816
24 com.apple.dt.Xcode 0x000000010b5e6efd main + 541
25 libdyld.dylib 0x00007fff203fc621 start + 1


Any suggestions would be appreciated!
Xcode 11.1 won't start (quit unexpectedly using the libMainThreadChecker.dylib plug-in)
 
 
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