I just tried to recreate your multiboot problem with OpenBSD. I could not duplicate your problem:
Step 1. Start with an empty drive -- with zeroes in all sectors.
Step 2. Install OpenBSD in an MBR paritition, type A6, with an OpenBSD disklabel. Have multiple OpenBSD partitions: "a", "b", "d", etc.
Step 3. Boot the NetBSD install media, and examine the drive.
The OpenBSD MBR partition exists on the drive, correctly.
The NetBSD disklabel shows two partitions: "d", the physical drive, and "e", the OpenBSD MBR partition.
Step 4. Install NetBSD, creating a new MBR partition and NetBSD partitions within it.
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