TYPO3 Core

Refused to apply style from 'https://t3core.localhost/Build/composer/public/typo3/main?token=80d4c64f1e289e50651c299d3e3a173d58b7c763' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

Found via patchset 9 of https://review.typo3.org/c/Packages/TYPO3.CMS/+/83027/9
https://git.typo3.org/typo3/CI/cms/-/jobs/3016881

1) Inline1nCest: Disable an Inline Element which has no checkbox for disabled state
 Test  Acceptance/Application/FormEngine/Inline1nCest.php:disableInline1nInlineElementWithoutRenderedDisableField
Found following JavaScript errors in the browser console:
18:25:42.44 SEVERE - http://web/typo3/record/edit?token=7f59b97d48ea3fd858f2b2c1bc91542804b38b1e&edit%5Btx_styleguide_inline_1n%5D%5B1%5D=edit&returnUrl=/typo3/module/web/list?token%3De6f62f45187ab9f4523b043b9357378cf58cdf7c%26id%3D127%26table%3D%26pointer%3D1 - Refused to apply style from 'http://web/typo3/main?token=56002678c4b7605eb7a5d9d1760554f92e7bf5d1' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
Scenario Steps:
 19. $I->click("button span[data...","[data-field-name...") at Acceptance/Application/FormEngine/Inline1nCest.php:172
 18. $I->waitForElement("input[data-formengine-input-na...") at Acceptance/Application/FormEngine/Inline1nCest.php:169
 17. $I->click("div[data-bs-togg...","[data-field-name...") at Acceptance/Application/FormEngine/Inline1nCest.php:168
 16. $I->click("inline_2") at Acceptance/Application/FormEngine/Inline1nCest.php:165
 15. $I->waitForText("Edit Form",3,"h1") at Acceptance/Application/FormEngine/Inline1nCest.php:44
 14. $I->click("#recordlist-tx_styleguide_inline_1n a[a...") at Acceptance/Application/FormEngine/Inline1nCest.php:43
Artifacts:
Png: /builds/typo3/CI/cms/typo3/sysext/core/Tests/../../../../typo3temp/var/tests/AcceptanceReports/TYPO3.CMS.Core.Tests.Acceptance.Application.FormEngine.Inline1nCest.disableInline1nInlineElementWithoutRenderedDisableField.ci.composer.headless.fail.png
Html: /builds/typo3/CI/cms/typo3/sysext/core/Tests/../../../../typo3temp/var/tests/AcceptanceReports/TYPO3.CMS.Core.Tests.Acceptance.Application.FormEngine.Inline1nCest.disableInline1nInlineElementWithoutRenderedDisableField.ci.composer.headless.fail.html