I've confirmed that my 4.2.0 builds work fine on BigSur but the 4.1.8 builds, even using Xcode10 and the 10.13SDK still result in core on macOS11. Below you'll find the stack.
My initial thoughts are that it is NOT a build issue, but rather a code one, so I'll start some investigation with that mindset and especially look at the diffs between AOO418 and AOO42X that might be key. Time Awake Since Boot: 1000 seconds System Integrity Protection: enabled Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000009 Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [1770] VM Regions Near 0x9: --> __TEXT 10d063000-10d064000 [ 4K] r-x/rwx SM=COW /Applications/OpenOffice-4.1.8.app/Contents/MacOS/soffice Application Specific Information: ViewBridge hint(s): ( "bridge key: delegateInvocation" ) Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 libs5abi_uno.dylib 0x00000001162d7259 s5abi::fillUnoException(s5abi::__cxa_exception*, _uno_Any*, _uno_Mapping*) + 41 1 libs5abi_uno.dylib 0x00000001162d98bd 0x1162d5000 + 18621 2 libs5abi_uno.dylib 0x00000001162d8e40 bridges::cpp_uno::shared::unoInterfaceProxyDispatch(_uno_Interface*, _typelib_TypeDescription const*, void*, void**, _uno_Any**) + 736 3 libuno_cppuhelpers5abi.dylib.3 0x000000010d4cd688 cppu::getCaughtException() + 840 4 libxstor.dylib 0x000000013868d104 OStorage::hasByName(rtl::OUString const&) + 964 5 libxo.dylib 0x0000000111d4b222 XMLVersionListPersistence::load(com::sun::star::uno::Reference<com::sun::star::embed::XStorage> const&) + 322 6 libxo.dylib 0x0000000111d4b9be non-virtual thunk to XMLVersionListPersistence::load(com::sun::star::uno::Reference<com::sun::star::embed::XStorage> const&) + 14 7 libsfx.dylib 0x000000010d807fcf SfxMedium::GetVersionList(com::sun::star::uno::Reference<com::sun::star::embed::XStorage> const&) + 271 8 libsfx.dylib 0x000000010d787753 sfx2::FileDialogHelper_Impl::updateVersions() + 547 9 libsfx.dylib 0x000000010d795afd sfx2::FileDialogHelper::FileSelectionChanged(com::sun::star::ui::dialogs::FilePickerEvent const&) + 29 10 libsfx.dylib 0x000000010d78715d sfx2::FileDialogHelper_Impl::fileSelectionChanged(com::sun::star::ui::dialogs::FilePickerEvent const&) + 45 11 fps_aqua.uno.dylib 0x00000001429242a0 0x142917000 + 53920 12 com.apple.AppKit 0x00007fff236752f5 -[NSSavePanel observeValueForKeyPath:ofObject:change:context:] + 562 13 com.apple.Foundation 0x00007fff2119bab8 NSKeyValueNotifyObserver + 327 14 com.apple.Foundation 0x00007fff21262e45 NSKeyValueDidChange + 431 15 com.apple.Foundation 0x00007fff21303539 NSKeyValueDidChangeWithPerThreadPendingNotifications + 146 16 com.apple.ViewBridge 0x00007fff2703dd9b __41-[NSViewBridge setObject:forKey:withKVO:]_block_invoke + 360 17 com.apple.ViewBridge 0x00007fff270b8829 withHintInProgress + 359 18 com.apple.ViewBridge 0x00007fff27035cb7 -[NSViewBridge setObject:forKey:withKVO:] + 641 19 com.apple.ViewBridge 0x00007fff27036e05 -[NSViewBridge nonLocalChangeInProgress:block:] + 230 20 com.apple.ViewBridge 0x00007fff27036b93 -[NSRemoteViewMarshal exceptionSafeSetRemoteObject:forKey:withReply:] + 264 21 com.apple.ViewBridge 0x00007fff27036a47 -[NSRemoteViewMarshal setRemoteObject:forKey:withReply:] + 56 22 com.apple.CoreFoundation 0x00007fff2041e56c __invoking___ + 140 23 com.apple.CoreFoundation 0x00007fff2041e410 -[NSInvocation invoke] + 303 24 com.apple.ViewBridge 0x00007fff27034b65 __deferNSXPCInvocationOntoMainThread_block_invoke + 228 25 com.apple.ViewBridge 0x00007fff27027d34 __wrapBlockWithVoucher_block_invoke + 37 26 com.apple.ViewBridge 0x00007fff27027a25 __deferBlockOntoMainThread_block_invoke_2 + 352 27 com.apple.CoreFoundation 0x00007fff2043b5a2 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12 28 com.apple.CoreFoundation 0x00007fff2043b44c __CFRunLoopDoBlocks + 437 29 com.apple.CoreFoundation 0x00007fff2043a7bd __CFRunLoopRun + 2582 30 com.apple.CoreFoundation 0x00007fff204396ce CFRunLoopRunSpecific + 563 31 com.apple.HIToolbox 0x00007fff286be6d0 RunCurrentEventLoopInMode + 292 32 com.apple.HIToolbox 0x00007fff286be4cc ReceiveNextEventCommon + 709 33 com.apple.HIToolbox 0x00007fff286be1ef _BlockUntilNextEventMatchingListInModeWithFilter + 64 34 com.apple.AppKit 0x00007fff22c56de9 _DPSNextEvent + 883 35 com.apple.AppKit 0x00007fff22c555af -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1366 36 com.apple.AppKit 0x00007fff22f2dde9 -[NSApplication _doModalLoop:peek:] + 303 37 com.apple.AppKit 0x00007fff22f2cba8 __35-[NSApplication runModalForWindow:]_block_invoke_2 + 64 38 com.apple.AppKit 0x00007fff22f2cb55 __35-[NSApplication runModalForWindow:]_block_invoke + 70 39 com.apple.AppKit 0x00007fff22f2c3a3 _NSTryRunModal + 100 40 com.apple.AppKit 0x00007fff22f2c288 -[NSApplication runModalForWindow:] + 128 41 com.apple.AppKit 0x00007fff2367615d -[NSSavePanel runModal] + 145 42 com.apple.AppKit 0x00007fff236764f1 -[NSSavePanel runModalForDirectory:file:types:] + 168 43 fps_aqua.uno.dylib 0x0000000142919b85 SalAquaPicker::run() + 261 44 fps_aqua.uno.dylib 0x0000000142919d82 SalAquaPicker::runandwaitforresult() + 34 45 fps_aqua.uno.dylib 0x000000014291a5f7 SalAquaFilePicker::execute() + 135 46 libsfx.dylib 0x000000010d78f7a0 sfx2::FileDialogHelper_Impl::implDoExecute() + 80 47 libsfx.dylib 0x000000010d790719 sfx2::FileDialogHelper_Impl::execute(SvStringsDtor*&, SfxItemSet*&, String&) + 761 48 libsfx.dylib 0x000000010d795cc4 sfx2::FileOpenDialog_Impl(long, String const&, SvStringsDtor*&, String&, SfxItemSet*&, String const*, short, String const&, com::sun::star::uno::Sequence<rtl::OUString> const&) + 132 49 libsfx.dylib 0x000000010d6e77b3 SfxApplication::OpenDocExec_Impl(SfxRequest&) + 1827 50 libsfx.dylib 0x000000010d93bf0b SfxDispatcher::Call_Impl(SfxShell&, SfxSlot const&, SfxRequest&, unsigned char) + 907 51 libsfx.dylib 0x000000010d93f27e SfxDispatcher::PostMsgHandler(SfxRequest*) + 270 52 libsfx.dylib 0x000000010d93c389 SfxDispatcher::LinkStubPostMsgHandler(void*, void*) + 9 53 libsfx.dylib 0x000000010d8c97af SfxHintPoster::LinkStubDoEvent_Impl(void*, void*) + 15 54 libvcl.dylib 0x000000010ee96a03 ImplWindowFrameProc(Window*, SalFrame*, unsigned short, void const*) + 5267 55 libvcl.dylib 0x000000010ebca255 AquaSalInstance::Yield(bool, bool) + 437 56 libvcl.dylib 0x000000010ec051e0 Application::Yield(bool) + 96 57 libvcl.dylib 0x000000010ec05167 Application::Execute() + 39 58 libsofficeapp.dylib 0x000000010d25a952 desktop::Desktop::Main() + 8642 59 libvcl.dylib 0x000000010ec0a9a8 ImplSVMain() + 72 60 libvcl.dylib 0x000000010ebc9e30 AquaSalInstance::handleAppDefinedEvent(NSEvent*) + 96 61 libvcl.dylib 0x000000010eea6d99 -[VCL_NSApplication sendEvent:] + 73 62 com.apple.AppKit 0x00007fff230b736e -[NSApplication _handleEvent:] + 65 63 com.apple.AppKit 0x00007fff22c47b2f -[NSApplication run] + 623 64 com.apple.AppKit 0x00007fff22c1bdf2 NSApplicationMain + 816 65 libvcl.dylib 0x000000010ebc8b75 ImplSVMainHook(unsigned char*) + 181 66 libvcl.dylib 0x000000010ec0b601 SVMain() + 17 67 libsofficeapp.dylib 0x000000010d27f8c8 soffice_main + 136 68 org.openoffice.script 0x000000010d063eb0 main + 16 69 org.openoffice.script 0x000000010d063e94 start + 52 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