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mc14052 -mac
As you guessed from the data sheets, CD405x's with a 5V supply won't work reliably when driven by 3.3V logic.
Try the 74HCT405x series or 74LC405x. They have TTL input logic levels (2.4V Vh, 3.15V max)
See **broken link removed** for data sheets.
You should also probably use...
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