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It's used to calculate a UDP port, so it could be that it is wrapping around and reusing ports if the number is in the right range.

I'd recommend using only values between 0 and 232 or perhaps lower. If you think a number you're using should not work, but is, I'd recommend opening an issue against Fast-RTPS. The issue you linked was that it was not working in certain ranges, which was expected. What you have is that it is working outside of the range you think it should, which may still be a bug.