Yes it runs to completion. I've scanned the log. Aside from a few plugs that are old and fail, most 90+ are successful. Here's a typical result for one plug. Others look similar:
LogFile: C:\Users\Bill Pearson\AppData\Roaming\Cakewalk\Logs\VstScanSandbox.log
Saturday, 13 Jun 2020, 09:50:03
Opened Log File -----------------------------
Command line: /VSTRegPerUser/VSTRegKey:"Software\Cakewalk Music Software\Cakewalk\Cakewalk VST X64"/Background/SONARHWND:9376626/ScanVst:"c:\program files\native instruments\kontakt 4\vstplugins 64 bit\Kontakt 4.dll"/ToastGuid:{475EDB57-E691-4165-AD5F-01461C97798E}
Flag: VSTRegPerUser
Flag: VSTRegKey:"Software\Cakewalk Music Software\Cakewalk\Cakewalk VST X64"
Flag: Background
Flag: SONARHWND:9376626
Flag: ScanVst:"c:\program files\native instruments\kontakt 4\vstplugins 64 bit\Kontakt 4.dll"
VST to scan - c:\program files\native instruments\kontakt 4\vstplugins 64 bit\Kontakt 4.dll
Flag: ToastGuid:{475EDB57-E691-4165-AD5F-01461C97798E}
VSTSCAN: ******* Analyzing VST plugins...
VSTSCAN: ---- 1: c:\program files\native instruments\kontakt 4\vstplugins 64 bit\Kontakt 4.dll ----
VSTSCAN: [ShortPath] c:\PROGRA~1\NATIVE~1\KONTAK~1\VSTPLU~2\KONTAK~3.DLL
VSTSCAN: [RegKey] Software\Cakewalk Music Software\Cakewalk\Cakewalk VST X64\Inventory\c:/program files/native instruments/kontakt 4/vstplugins 64 bit/Kontakt 4.dll
VSTSCAN: ---- Loading VST plugin c:\program files\native instruments\kontakt 4\vstplugins 64 bit\Kontakt 4.dll ----
VSTSCAN: DLL loaded successfully...
VSTSCAN: Successfully got entry point. DLL is a VST plugin...
VSTSCAN: Calling entry point...
VSTSCAN: Created plugin instance...
VSTSCAN: > dispatcher( effVendorSpecific=50(effVendorSpecific), 1130457957, 000000007FFF0003, 0000000000146DBC, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000000
VSTSCAN: > dispatcher( effGetPlugCategory=35(effGetPlugCategory), 0, 0000000000000000, 0000000000000000, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000002
VSTSCAN: Checking Plugin properties...
VSTSCAN: > dispatcher( effOpen=0(effOpen), 0, 0000000000000000, 0000000000000000, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000000
VSTSCAN: > dispatcher( effGetProgram=3(effGetProgram), 0, 0000000000000000, 0000000000000000, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000000
VSTSCAN: > dispatcher( effCanDo=51(effCanDo), 0, 0000000000000000, 00000001400484A0, 0.000000 )
VSTSCAN: < dispatcher = FFFFFFFFFFFFFFFF
VSTSCAN: > dispatcher( effGetPlugCategory=35(effGetPlugCategory), 0, 0000000000000000, 0000000000000000, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000002
VSTSCAN: > dispatcher( effSetSampleRate=10(effSetSampleRate), 0, 0000000000000000, 0000000000000000, 44100.000000 )
VSTSCAN: < dispatcher = 0000000000000000
VSTSCAN: > dispatcher( effSetBlockSize=11(effSetBlockSize), 0, 0000000000000200, 0000000000000000, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000000
VSTSCAN: > dispatcher( effCanDo=51(effCanDo), 0, 0000000000000000, 0000000140045538, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000001
VSTSCAN: > dispatcher( effGetVendorString=47(effGetVendorString), 0, 0000000000000000, 00000000001494D0, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000001
VSTSCAN: > dispatcher( effGetEffectName=45(effGetEffectName), 0, 0000000000000000, 00000000001498D0, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000001
VSTSCAN: > dispatcher( effGetProductString=48(effGetProductString), 0, 0000000000000000, 00000000001490D0, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000001
VSTSCAN: > dispatcher( effCanDo=51(effCanDo), 0, 0000000000000000, 0000000140045508, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000001
VSTSCAN: > dispatcher( effVendorSpecific=50(effVendorSpecific), 1936999233, 0000000046554944, 0000000000148FB0, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000000
VSTSCAN: > dispatcher( effClose=1(effClose), 0, 0000000000000000, 0000000000000000, 0.000000 )
VSTSCAN: < dispatcher = 0000000000000001
VSTSCAN: Finished checking plugin properties...
VSTSCAN: Unloading VST dll...
VSTSCAN: VST plugin successfully scanned
VSTSCAN: WRITE VST DATA...
VSTSCAN: WRITE VST DATA - successfully wrote complete VST plugin inventory record...
VSTSCAN: Finished analyzing VST plugins - 1 of 1 VST plugins were scanned in this run
Closing log file
Saturday, 13 Jun 2020, 09:50:03