Here are the steps:
I imported an FBX. Made a prefab out of it, put it into the scene.
Then I alt-middle clicked and moved the mouse.
CC freezes up. When pressing the Editor will crash.
Tested this three times with various models and a new empty project.
Identifier: com.cocos.creator
Version: 3.0.1 (3.0.1)
Code Type: X86-64 (Native)
Parent Process: CocosDashboard [1155]
Responsible: CocosCreator [8247]
OS Version: Mac OS X 10.14.6 (18G6020)
Crashed Thread: 0 CrBrowserMain Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [8247]
VM Regions Near 0:
-->
__TEXT 00000001071fd000-0000000107225000 [ 160K] r-x/r-x SM=COW /Applications/CocosCreator/*/CocosCreator.app/Contents/MacOS/CocosCreator
Thread 0 Crashed:: CrBrowserMain Dispatch queue: com.apple.main-thread
0 com.github.Electron.framework 0x000000010b1380fe v8::internal::compiler::ZoneStats::GetCurrentAllocatedBytes() const + 4475326
1 com.github.Electron.framework 0x000000010863e770 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 3847200
2 com.github.Electron.framework 0x000000010863e7d2 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 3847298
3 com.github.Electron.framework 0x0000000108645dbc v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 3877484
4 com.github.Electron.framework 0x0000000108645bf0 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 3877024
5 com.github.Electron.framework 0x000000010b14098d v8::internal::compiler::ZoneStats::GetCurrentAllocatedBytes() const + 4510285
6 com.github.Electron.framework 0x000000010b2e9d9f v8::internal::compiler::ZoneStats::GetCurrentAllocatedBytes() const + 6252127
7 com.apple.CoreFoundation 0x00007fff45eac99c __invoking___ + 140
8 com.apple.CoreFoundation 0x00007fff45eac86f -[NSInvocation invoke] + 311
9 com.apple.CoreFoundation 0x00007fff45f0c1e1 -[NSInvocation invokeWithTarget:] + 56
10 com.apple.CoreFoundation 0x00007fff45ef52b1 ___forwarding___ + 767
11 com.apple.CoreFoundation 0x00007fff45ef4f28 _CF_forwarding_prep_0 + 120
12 com.apple.AppKit 0x00007fff436b7f28 -[NSTrackingArea mouseMoved:] + 151
13 com.apple.AppKit 0x00007fff435f0b25 -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 4726
14 com.apple.AppKit 0x00007fff435ef667 -[NSWindow(NSEventRouting) sendEvent:] + 478
15 com.github.Electron.framework 0x00000001091137f1 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 15205537
16 com.apple.AppKit 0x00007fff4348f994 -[NSApplication(NSEvent) sendEvent:] + 3220
17 com.github.Electron.framework 0x00000001078ab453 ElectronInitializeICUandStartNode + 1622419
18 com.apple.AppKit 0x00007fff4347d5c0 -[NSApplication run] + 755
19 com.github.Electron.framework 0x000000010886e0a6 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 6139222
20 com.github.Electron.framework 0x000000010886d082 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 6135090
21 com.github.Electron.framework 0x000000010883c5e1 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 5935761
22 com.github.Electron.framework 0x000000010881ad19 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 5798345
23 com.github.Electron.framework 0x000000010aee5744 v8::internal::compiler::ZoneStats::GetCurrentAllocatedBytes() const + 2039812
24 com.github.Electron.framework 0x00000001084bad42 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 2259442
25 com.github.Electron.framework 0x00000001084b6809 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 2241721
26 com.github.Electron.framework 0x000000010847bda1 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 2001489
27 com.github.Electron.framework 0x000000010847bac6 v8::internal::SetupIsolateDelegate::SetupHeap(v8::internal::Heap*) + 2000758
28 com.github.Electron.framework 0x0000000107cc4d3e ElectronInitializeICUandStartNode + 5921406
29 com.github.Electron.framework 0x0000000107cc5242 ElectronInitializeICUandStartNode + 5922690
30 com.github.Electron.framework 0x000000010771f288 ElectronMain + 136
31 com.cocos.creator 0x00000001071fdf3d 0x1071fd000 + 3901
32 libdyld.dylib 0x00007fff71f093d5 start + 1