Unable to step through code STM32L433CCUx

This was working fine on a development board, download to flash is also enabled.
I started a new project the same way, only difference is really that I'm now using dedicated ST-LINK/V2 programmer, firmware is up-to-date.
When I go to debug, I can only step through assembly code.
Looks like it never enters main. I can't even get a breakpoint to catch in Reset_Handler, LDR R0, =SystemInit

Strangely trying the same thing in system workbench works just fine.

Btw. it would help if this forum would let me upload some screenshots.

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