Crashes on v3.16.6

[colliera]

Hi, I don't have the plugin QGIS2threejs installed like some other users in these posts, but as soon as I tick on Digitizing Tools, QGIS crashes out in both 3.10.3 and 3.16.6. These are the other plugins I have installed, but it still crashes out even with them all switched off:

There is no log from inside QGIS, as the application just closes, but this is the Windows Event log:
Faulting application name: qgis-ltr-bin-g7.exe, version: 0.0.0.0, time stamp: 0x607a5c71
Faulting module name: qgis-ltr-bin-g7.exe, version: 0.0.0.0, time stamp: 0x607a5c71
Exception code: 0xc0000409
Fault offset: 0x00004e8b
Faulting process id: 0x23e4
Faulting application start time: 0x01d7ae0e5fdbec5f
Faulting application path: C:\Program Files (x86)\QGIS 3.16\bin\qgis-ltr-bin-g7.exe
Faulting module path: C:\Program Files (x86)\QGIS 3.16\bin\qgis-ltr-bin-g7.exe
Report Id: 90306fa4-7ae3-4b17-bb66-8e668852d022
Faulting package full name:
Faulting package-relative application ID:

Happy to work with anyone on resolving this as the split polygon tool would be really useful.

Regards,