[Bug] Cookie Tag is replaced by fix value

- Insomnia Version: 7.0.1
- Operating System: Windows 10

## Details

We have a "Request A", which returns a value in a cookie. Then we have a "Request B" with a different domain, which needs the same cookie with the exact same value. So I used the "Cookie" Tag to inject the Cookie-Value from Request A to the Cookie-Value of Request B.
The problem is, that this tag is replaced by the value after a short period of time. I don't know exactly why and when, but it happends several times a day.

Start by reproducing the issue in Insomnia 7.0.1 on Windows 10 with Request A returning a cookie and Request B using the Cookie Tag on another domain. Investigate why the tag is replaced after a short, unspecified period; the work is done when the cause is identified and the cookie value remains correct during repeated use.

Written by the indexing model from the issue text.