Debugging a modal dialog

Hey! I debug a UI system, there’s a UI process communicating with a privileged service. For certain sensitive settings the UI prompts the user for confirmation - sensible. The way it works is the settings changes are communicated to the service via RPC and the service, if changed setting is considered dangerous, creates a new dedicated instance of the UI process (different cmdline tho) to host the dialog
Id like to debug the process hosting the dialog whenever launch, tried to TTD record it but fails, probably due to protection of the product, tried to attach from kernel after the dialog is already shown, first breakpoint is hit, but then I see prints like “only x86 user mode context is available” , the machine I debug is frozen and if I remove the breakpoints it works again, so I assume those prints are breakpoints being triggered failed to be handled by the debugger, maybe because it’s a 32bit process on an x64 debugging session? Anyways any recommendation for a comfortable approach to debug the said process would be appreciated and welcomed!