These will be fixed eventually, but as this is not an enterprise product, you will have to work around them until they are.
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Does not handle times that cross midnight very well (will stop at 23:59 one one day and resume at 00:00 the next day), so try to have a sane sleep rythm that does not involve being awake past midnight.
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Task-Deadlines that are further in the future the pre-cached day-count (default: 1000 days / ~3 years) will cause unpredictable behaviour when calculating a schedule.
Keep in mind that almost all objects will behave differently depending on whether they are in the context of a calculated schedule or not. This means that they may export more or different values based on an overloaded parameter.
Also, copy() may not always copy over all values, as the requirements are context-dependent. In these cases, fullCopy() is supplied. When in doubt, check the implementation.