'Laravel 8 config:cache allowing sending emails but can't read env variables after config:cache

hope you are all fine. I am facing an issue when I am running command

php artisan config:cache

email is sending but I can't read env('DB_HOST') variables.

Similarly when I run then this time:

php artisan config:clear

email is not sending, now I can read env('DB_HOST') variables.

I don't understand what is issue.

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