What I normally do in this situation is closely monitor the cut - once the small triangle cut is finished, pause the cut, remove the triangle, and then resume it. I can only recommend it for one-offs or parts/lettering that don’t have that many pieces like this.
You could try running the job without pausing or a tab on the triangle and let it blown away and into the bottom of the tank. I’d maybe raise the cut head a smidge so you’re less likely to get the triangle stuck between the material and the cut head.