The FMCOMMS3 schematic plug PGOOD of ADP2164ACPZ (U301) with a pull-up on 3V3 and connect it to Enable pin of ADP1755ACPZ (U302 and U303).
The "EN" pin of ADP1755ACPZ has an absolute maximum rating of Vin. Vin is 1V8 in the schematic.
Sounds like the absolute max rating is not respected.
Bug in the schematic or in 1755 datasheet?