Bug: Wavetable only imports to left channel

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I'm on the dev build of Hise and there's a bug where if you drag and drop a sample into the wavetable waterfall (floating tile) component or via the wavetable synth module, sometimes the wavetable will be hard panned to the left, and the right channel doesn't get converted. I can't find any real correlation with the sample type, length etc - seems to be random. I think this has been a bug for a while.

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Also sometimes import fails and this is displayed on the wavetable synth:

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Update: also happens the other way around, so essentially only one channel gets converted sometimes (left or right)