The problem can be fixed by opening FL Studio in Rosetta mode instead of native (as described in the FL Studio FAQs under “FL Studio Apple Silicon / ARM / M1 / M1X Support”)
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Open the Finder to Macintosh HD > Applications and Right-click FL Studio.
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Click 'Get Info' on the pop-up.
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Check the box, 'Open using Rosetta' to run the Intel version of FL Studio under Rosetta 2.