This behavior is definitely caused by adobe sdk. You won't believe how many odd bugs it still contains. Some of could be fixed, some are hard to skirt.
I have tested your file with new PDFreader and can confirm some issues are still there (missingspaceproblem and slowdown of going to next page by particular high number of annotations per page). öäüß problem has been already solved. Our best adobe specialist is trying to fix the other issues now.
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