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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@virtualcodewarrior
The device is a RRD-102V2.0 module that has a RDA5807M Fm radio chip.
According to the specs, It should be capable of 400kHz I2C communication speeds.
Google for RDA5807M will bring up the data sheet.
I managed to get slightly higher resolution that shows the glitch even better
The glitch shows up even if not connected to the radio module and rda and scl just connected to the two pullup resistors.