Same problem here.
Process:							 Keychain Access [941]
Path:									/System/Applications/Utilities/Keychain Access.app/Contents/MacOS/Keychain Access
Identifier:						Keychain Access
Version:							 11.0 (55281.40.7.0.1)
Build Info:						KeychainAccess-55281040007000001~164
Code Type:						 X86-64 (Native)
Parent Process:				??? [1]
Responsible:					 Keychain Access [941]
User ID:							 502
Date/Time:						 2020-11-15 15:49:56.835 -0300
OS Version:						macOS 11.0.1 (20B29)
Report Version:				12
Bridge OS Version:		 3.0 (14Y908)
Anonymous UUID:				8F8AD05D-B28B-7570-E415-2B35FF2D0EEC
Time Awake Since Boot: 180 seconds
System Integrity Protection: enabled
Crashed Thread:				0	Dispatch queue: com.apple.main-thread
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 [941]
Application Specific Information:
dyld3 mode
Andre991
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