Checkout a tagged release's source code (like v21.02.0)

You may be doing something wrong.
I tested cloning & checkout of v18.06.1 earlier today, as shown here, and it worked quite ok:

The commands needed for a clean clone a really simple:

git clone https://git.openwrt.org/openwrt/openwrt.git
cd openwrt
git checkout v18.06.1
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