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mount overlayfs fails when booted from liveUSB (20.04)

ec flag

Release 20.04 LTS, usb stick made with Make Startup Disk of Ubuntu 20.04 LTS.

Simple script which is expected to run and runs fine on installed system fails when run on system booted from liveUSB (no boot options added, including persistence):

sudo mkdir /1 && cd $_
sudo mkdir upper lower work merged
sudo mount -t overlay test_ovfs -o upperdir=upper,lowerdir=lower,workdir=work merged
mount: /1/merged: wrong fs type, bad option, bad superblock on test_ovfs, missing codepage or helper program, or other error

Why? Doesn's filesystem of liveUSB support overlayfs?

Added 1:

Interestingly doing the same in /media/ubuntu/writable1/1 instead of /1 (second stick was inserted after first test) works.

/media/ubuntu/writable1 is part of whole filesystem, why works there but not more close to the root?

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