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It's the sharp transition/edge/corner between the end of the bait and the vertical sprue. Bubbles need very little to hold them from smoothly rising to the top. Had that large bubble found a smooth transition at that particular intersection, it would have slipped around the corner and continued upward. There should be a radius instead of a sharp edge. You can create that by using a hand "deburring tool" that machinists use, or just using a very fine sandpaper and rounding the edge over. Don't over due it. Just getting rid of the sharp edge is all that is needed. Even a small polishing tool in a electric hand rotary device may be enough. That's my 2 cents worth...

No one doubts that fish use the sense of smell and taste in determining what is or isn't food. But I have never been sold on the marketing sales pitch that fish are "attracted" to a presentation that utilizes a particular scent. After 40 years of angling for bass, my experience tells me that my catch ratios do not go up or down because I use (or do not use) manufactured scent on my baits. What I DO believe is that there are human-made chemicals that will turn fish off - especially those often found on the anglers hands. (Gasoline, sunscreen, etc.) So in my mind, what organic scents sold in bottles (or gel form) may actually accomplish is "Masking" the human chemicals that are transferred to our bait through our handling of them. Having said that, I also understand that the key component for success as an angler is "Confidence". Should someone use scent and it mentally provides them with additional confidence in their presentation, then just that cognitive advantage makes the smelly product valuable to that individual. So far the scientific studies and research have contradicting conclusions and have yet to satisfy the angling community with definitive means of settling this scent debate. However, whether the scent actually works or doesn't, the thing that most of us can agree upon... is that it can't hurt.

New one on me too. Hopefully you can get it worked out with the plastic manufacturer and get the product replaced. I’m guessing you have used their plastic in the past with good success?

Contact the plastic maker and ask them.