1Password 8 crashes immediately every time I try to autofill in Safari.

macOS Catalina 10.15.7 (19H1824)
MacBook Pro (Retina, Mid 2012)

Safari 15 Version 15.4 (15613.1.17.1.13, 15613)

Happens with Safari only. Happens with command-\ only. Happens with the new Safari extension from the Mac App Store installed and without it installed.

I deleted 1Password 8, all traces of past versions of 1Password, and every trace of any file and directory containing the strings 'agilebits' '1password' 'onepassword' everywhere on the system including everything in /Library/ and ~/Library, containers, preferences, extensions in other browsers, etc. then restarted then searched for any remainders and then reinstalled 1Password 8 again and reproduced the problem immediately.

Crash report:
Process: 1Password [749]
Path: /Applications/1Password.app/Contents/MacOS/1Password
Identifier: com.1password.1password
Version: 8.7.0 (8.7.0.109983)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: 1Password [749]
User ID: 501

Date/Time: 2022-05-11 16:09:57.083 -0400
OS Version: Mac OS X 10.15.7 (19H1824)
Report Version: 12
Anonymous UUID: 728F2C38-1C12-7564-757C-499C87E63251

Time Awake Since Boot: 370 seconds

System Integrity Protection: enabled

Crashed Thread: 46 tokio-runtime-worker

Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Illegal instruction: 4
Termination Reason: Namespace SIGNAL, Code 0x4
Terminating Process: exc handler [749]

Application Specific Information:
BUG IN CLIENT OF LIBDISPATCH: Assertion failed: Block was expected to execute on queue [com.apple.main-thread]

Thread 0:: CrBrowserMain Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff6988edea mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff6988f160 mach_msg + 60
2 com.apple.CoreFoundation 0x00007fff3061d387 __CFRunLoopServiceMachPort + 247
3 com.apple.CoreFoundation 0x00007fff3061be41 __CFRunLoopRun + 1329
4 com.apple.CoreFoundation 0x00007fff3061b2b3 CFRunLoopRunSpecific + 466
5 com.apple.HIToolbox 0x00007fff2f288aad RunCurrentEventLoopInMode + 292
6 com.apple.HIToolbox 0x00007fff2f2887c5 ReceiveNextEventCommon + 584
7 com.apple.HIToolbox 0x00007fff2f288569 _BlockUntilNextEventMatchingListInModeWithFilter + 64
8 com.apple.AppKit 0x00007fff2d8d1659 _DPSNextEvent + 883
9 com.apple.AppKit 0x00007fff2d8cfea0 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352
10 com.apple.AppKit 0x00007fff2d8c1bae -[NSApplication run] + 658
11 com.github.Electron.framework 0x000000010ca524c6 node::AsyncResource::get_async_id() const + 8884774
12 com.github.Electron.framework 0x000000010ca50d92 node::AsyncResource::get_async_id() const + 8878834
13 com.github.Electron.framework 0x000000010ca12efa node::AsyncResource::get_async_id() const + 8625242
14 com.github.Electron.framework 0x000000010c9dcc01 node::AsyncResource::get_async_id() const + 8403297
15 com.github.Electron.framework 0x000000010bce5e04 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 5185764
16 com.github.Electron.framework 0x000000010bce7742 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 5192226
17 com.github.Electron.framework 0x000000010bce3510 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 5175280
18 com.github.Electron.framework 0x0000000109e9b6e5 v8::internal::ExternalReference::fast_c_call_caller_pc_address(v8::internal::Isolate*) + 1957
19 com.github.Electron.framework 0x0000000109e9c8b3 v8::internal::ExternalReference::fast_c_call_caller_pc_address(v8::internal::Isolate*) + 6515
20 com.github.Electron.framework 0x0000000109e9c331 v8::internal::ExternalReference::fast_c_call_caller_pc_address(v8::internal::Isolate*) + 5105
21 com.github.Electron.framework 0x0000000109e9a8ed v8::internal::compiler::BasicBlock::set_loop_header(v8::internal::compiler::BasicBlock*) + 12173
22 com.github.Electron.framework 0x0000000109e9b223 v8::internal::ExternalReference::fast_c_call_caller_pc_address(v8::internal::Isolate*) + 739
23 com.github.Electron.framework 0x0000000109bcd568 ElectronMain + 152
24 libdyld.dylib 0x00007fff6974dcc9 start + 1

[abridged due to length constraint]

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1Password Version: 8
Extension Version: Not Provided
OS Version: macOS 10.15.7