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It looks like Mono doesn't support System.Text.Encoder.Convert is different then the .NET implementation. In my case I am using the UTF8Encoding.
When passing a byteCount to the method, the Mono implementation does not take all bytes up to the byteCount, but instead just uses some chars of the given text.
The .NET implementation (correctly) takes as many chars as really fit into the buffer.
Attached you can find a small testcase, which works with .NET but not with Mono:
Created attachment 7515 [details]
The attached code shows some workaround for this problem. Yet it would be much easier to fix in the Mono class libraries.
Created attachment 7516 [details]
Thank you for the detailed bug report.
The pull request for this issue can be found in the link below.
this has been merged
Unfortunately the attached testcase ConvertShortText does still not work.
The attached test case is working fine with mono 4.0.0.