Sentry crashes complete website on PHP 7.4

[JE4GLE]

Environment

How do you use Sentry?
Sentry SaaS (sentry.io)

Which SDK and version?
sentry/sdk 3.1.1
sentry/sentry 3.3.7

My personal composer require contains:
"php": ">=7.4",
"sentry/sdk": "^3.0.0"

Steps to Reproduce

1. Updated Sentry using composer update
2. Uploaded vendor directory to my PHP 7.4 webserver
3. My website instantly displays the error message mentioned below (Case A)
4. I updated my composer again using composer update --ignore-platform-reqs
5. Uploaded vendor directory again
6. Now, nothing is shown (Case B), even with error_reporting(true); and ini_set('display_errors', true);
7. I remove the Sentry initialization and now my website works again

Expected Result

My Website to display

Actual Result

Case A: Just the message: Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 8.0.2".

Case B: No response, just white

Comment

According to my steps, I think the error is in my configuration or Sentry itself. Please tell me, if you need some additional information. Disabling Sentry is just a temporary fix for me and I want to have it back up running as soon as possible :)