Whenever I yank text to the clipboard register, the content of the unnamed register changes.

For example, yanking the word "This" to the unnamed register:

This is a test
^
yw

The unnamed register now contains "This".

Then yanking the word "test" to the * register:

This is a test
          ^
          "*yw

The * register contains now "test".

I expect the unnamed register to still contain "This". However, if I do a simple put, "test" is insert:

This is a test
              ^
              p

This is a test test

From my understanding, yanking to the clipboard register should not replace the unnamed register. Is there a way of preventing this from happening?

Vim version: 8.2