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I2C not working on SSD1327 #699
SPI working with your library:
I2C with library U8G2 not working:
In I2C mode, you must connect connect the DC input to either low or high, you can not leave it open. If open, then the display will draw much more current and the I2C address is unpredictable. All in all you should follow the wiring instructions in chapter 8 of the SSD1327 controller datasheet.
In general U8g2 always uses the lowest I2C address allowed by the display. I would personally call this a useful default.