I’ve experienced it just now. Charged from 0 to 42% with a usb-c charger, then it showed 188. Battery was quite warm. Tried 2 more times and still blinking with 188.
I’ve disconnected it, pressed the button for 20-25 seconds, but no reaction from the device (maybe it has to be done while connected and 188 is blinking, not sure).
I’ve waited 1 min, switch to a USB-A to USB-C charger, then it kept charging.
Possibly just a battery protection thing when the battery is over heating.
Not sure.