A production error by Circuit 1 has resulted in one or more of the company's billet pulser covers for the 919 being distributed w/o the internal tab that holds the oil sealing plug in place. Without that tab, the oil sealing plug can fall out and engine oil pressure will be lost.
The right side of the photograph below shows the inside of the stock pulser cover with the referenced tab clearly visible in the vicinity (just left and below) of the upper right-hand bolt hole. The Circuit 1 unit is on the left, and can be seen to not have the required tab.
Consider checking the interior of your Circuit 1 billet pulser cover to confirm your unit displays the oil sealing plug tab.
If it does not, contact the vendor and do not run the engine until you reinstall the stock pulser cover.