There are a couple of bugs wtih voicelines.
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Default Voiceline stops working - When using V to use the default voiceline repeatedly, it will eventually stop working completely. If you bind the identical voiceline to the voiceline wheel, you can access the voiceline by using right, left or down, but not the default one. Eventually some of the other directions also stop working.
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The wrong standard voiceline is played. This one is harder to reproduce but does happen consistently if tried multiple times. This applies to the standard shared voicelines (e.g. Yes, Understand, Thank You, No, etc.) and not charcter specific ones. If you say one default voiceline (e.g. “Thank you” and then follow it up with a different one like “Yes”, the character will say “Thank you” instead of the expected “Yes”).