@andr3a88 answer is correct. Removing Firebase/Performance fixed all the crash issues.

My crash free decreased from 99% to 72% after using XCode 12 (iOS14) to compile Crash Log - https://developer.apple.com/forums/content/attachment/c7b5620b-be59-473f-b3f3-cb1cfc4bdb25

0	libobjc.A.dylib								0x1b87a8df0 objc_release + 16 1	Foundation										 0x1a61df57c NSKeyValuePopPendingNotificationLocal + 60 2	Foundation										 0x1a61df4f8 NSKeyValueDidChange + 356 3	Foundation										 0x1a61def64 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKeys:count:maybeOldValuesDict:maybeNewValuesDict:usingBlock:] + 624 4	Foundation										 0x1a6123800 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKey:key:key:usingBlock:] + 68 5	Foundation										 0x1a61da3d8 _NSSetLongLongValueAndNotify + 284 6	CFNetwork											0x1a56fd074 _CFNetworkHTTPConnectionCacheSetLimit + 153068 7	Foundation										 0x1a6201cc8 NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK + 16 8	Foundation										 0x1a60feb18 -[NSBlockOperation main] + 100 9	Foundation										 0x1a6203f80 NSOPERATION_IS_INVOKING_MAIN + 20 10 Foundation										 0x1a60fe7d4 -[NSOperation start] + 784 11 Foundation										 0x1a6204978 NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION + 20 12 Foundation										 0x1a6204444 __NSOQSchedule_f + 180 13 libdispatch.dylib							0x1a4b4d93c _dispatch_block_async_invoke2 + 104 14 libdispatch.dylib							0x1a4b9e280 _dispatch_client_callout + 16 15 libdispatch.dylib							0x1a4b4356c _dispatch_continuation_pop$VARIANT$mp + 412 16 libdispatch.dylib							0x1a4b42cb0 _dispatch_async_redirect_invoke + 596 17 libdispatch.dylib							0x1a4b5011c _dispatch_root_queue_drain + 376 18 libdispatch.dylib							0x1a4b508e4 _dispatch_worker_thread2 + 124 19 libsystem_pthread.dylib				0x1ea848568 _pthread_wqthread + 212 20 libsystem_pthread.dylib				0x1ea84b874 start_wqthread + 8