In some cases, the function information cannot be parsed

[czghzc]

The "ExtTextOut" function in the figure below is not resolved

[ThunderCls]

That call won't be processed. You can find the why in the "known issues and limitations" section on the readme

...according to the actual desgin of the plugin (no jumps among functions arguments) these calls won't be processed, since each time a jump is found the instructions in the stack are cleaned.