Hello support! The following problems arose when migrating to the platform JForex3.
1. When drawing a custom indicator, the parameter startIndex = 0 was passed to the method calculate earlier JForex2. Now in JForex3 startIndex!= 0 probably =getLookback. Indicators are not compatible and as a result an error is issued!
2. Levels in the indicator are not saved when going to the new platform!
What is the reason?

Please provide code that would reproduce the problem.

Hello support! I checked that similar problems arise in the simplest example
https://www.dukascopy.com/wiki/files/9b3d27d020edff568a99b15876a8b673.txt
in wiki topic Simple custom indicator
https://www.dukascopy.com/wiki/en/development/strategy-api/indicators/use-custom-indicator-in-strategies.
Before code

 //calculating startIndex taking into account lookback value
        if (startIndex - getLookback() < 0) {
            startIndex -= startIndex - getLookback();
        }

value startIndex ==0 in JForex2 and startIndex ==getLookback in Jforex3.
Also indicator levels are not preserved when passing from JForex2 a to JForex3, and vice versa.

We were unable to reproduce this issue.