Shared folder crash (FreeBsd guest in VirtualBox)?

Question

FreeBSD

Good afternoon! Input:
FreeBSD 12 -
Windows 7 guest -
VirtualBox 6 host - Virtualization system
FreeBSD has a shared folder mounted from Windows.
Mount point: /media/web3s
Permissions on /media/web3s: 777
Option 1.
cd /
mkdir /media/web3s/test1
cd /media/web3s/test1
cd /
mkdir /media/web3s/test1/qwerty
Runs without errors.
Option 2.
cd /
mkdir /media/web3s/test1
mkdir /media/web3s/test1/qwerty
Gives an error:
mkdir: /media/web3s/test1: No such file or directory
Option 3.
cd /
mkdir /media/web3s/test1
cd /media/web3s/test1
cd /
echo "qwerty" > /media/web3s/test1/file1.txt
echo "qwerty2" > /media/web3s/test1/file1.txt
echo "qwerty3" > /media/web3s/test1/file1.txt
Runs without errors.
Option 4.
cd /
mkdir /media/web3s/test1
echo "qwerty" > /media/web3s/test1/file1.txt
Gives an error:
mkdir: /media/web3s/test1: No such file or directory
PS: The -p switch solves folder creation problems, but the file problem remains.
Help, in which direction to dig?