PSA: if you try to partition an M1 mac with Disk Utility, it works, but it breaks recovery mode. Presumably the bootloader hardcodes that recovery is partition #3... instead of using GPT partition type codes as it should. Deleting the partition fixes it...
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Hrm, is this within the APFS container / CoreStorage volume (I can’t keep track of how many layers they’re at now) or actual GPT partitions?
Actual GPT partitions. There are three APFS containers on the SSD. I shrunk the middle (main) one and created a strandard (placeholder) HFS+ partition.
