Comment by magicalhippo

AfAIK lots of 8051-based microcontrollers that are quite modern, such as Silicon Labs EFM8 line[1] or STC which in addition to 8-bit 8051's also has 32-bit 8051 variants[2].

[1]: https://www.silabs.com/mcu/8-bit-microcontrollers

[2]: https://www.stcmicro.com/stc/stc32g.html