If you're using the Play Panel to override the tempo, that's the way it's supposed to work. You need to add the tempo to your score as described at https://musescore.org/en/handbook/tempo-0. If you still have problems, we'll be very happy to help you if you bring your question to the forums at http://musescore.org/en/forum instead of filing bug reports.
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If you're using the Play Panel to override the tempo, that's the way it's supposed to work. You need to add the tempo to your score as described at https://musescore.org/en/handbook/tempo-0. If you still have problems, we'll be very happy to help you if you bring your question to the forums at http://musescore.org/en/forum instead of filing bug reports.