They're not "issues," they are normal for complex lens designs and this is considered "minimal" lens flare for such lenses.
Again, photography site DXOMARK stated:
The Apple iPhone 11 Pro Max camera generally controls image artifacts very well, which is why the device achieves a high score in this category. When viewing images at full size, some ringing can be visible along high-contrast edges, but it’s usually not too intrusive. Our testers also found flare artifacts in a small number of our sample images, such as in the shot below, but the iPhone generally controls flare well.
(DXOMARK is not paid by Apple.)
If you have designed something better, please give Apple, Google or Samsung a call - I'm sure any of them would love to send you a big check for your massive advancement in optical design, especially to use it on an exclusive basis and beat the other two companies.
If you have an issue with it, I've already given you the solution, and that is to return or sell your phone and purchase something else, as you're never going to be happy with whichever member of the iPhone 11 family you own.
If you want to avoid it, stop taking photos in conditions guaranteed to induce lens flare with any complex lens design.