Using the split function in expression with the '.' character return a empty dataset
split("[default]Process/P_01/INLETW/02_WAP/12PC05/Sts/Value.EngHigh",".")
split("[default]Process/P_01/INLETW/02_WAP/12PC05/Sts/Value.EngHigh","/")
This looks like a bug.
Using Ignition Version 8.1.43 (b2024082010)