Too many Primary partitions (MBR) after installing Ubuntu

Question

I am using a Sony (sve15118fnb) laptop. Recently I installed windows 10 and decided to dual boot it with Ubuntu. The disk uses MBR partition table, so the maximum number of primary partitions allowed is 4.

The disk partitions before installing Ubuntu, the red boundary indicates what was a logical partition before installing Ubuntu:

This makes 3-primary and 1-logical partition. But while installing Ubuntu, I went with the default (primary) as the partition type for swap and root directories. And after installing Ubuntu, the disk management shows partitions like this after installing Ubuntu

This makes 5-primary!! and 1-logical partition. How is this possible?

PS: While installing Ubuntu, I didn't get any error/warning about the max number of primary partitions allowed. But every time before booting into Ubuntu this message shows up and only shows when booting to Ubuntu and not while booting to Windows:

Answer 1

These non-named partitions on Windows 10 device management are created from Linux Ubuntu and not created from Windows because there are the partitions that would not show up in Computer but you will see it on Device Management and you are unable to access these drives, so you might get the partitions beyond the limit.