I am having the most bizarre experience with STM32F030CC on a board assembled by JLCPCB.

One of the boards had the markings missing, but JLCPCB provided me photos showing that markings was present in the AOI. They fell off along the way.

Also, the microcontroller reports ChipID 0x442, which stlink-org reports as STM32F09x. STM32F030 should be 0x440.