Backend Module crashes on loading

Hi

Today I installed the extension nnrestapi according to the instructions. I could not call the backend module. The logs reported the following error:

PHP Warning
Core: Error handler (BE): PHP Warning: Attempt to read property "psr-4" on null in /var/www/virtual/itcaluch/velocasa_dev/public/typo3conf/ext/nnrestapi/Classes/Utilities/Endpoint.php line 488

Without further ado I installed a fresh TYPO3 instance. The installation and use of nnrestapi worked perfectly there. In the following I compared the two installations:

.htaccess
Site configuration
System Extensions
Own Plugins
.env settings

Finally, I came across a small difference: The non-working instance is running in development mode, the working one in production mode. In development mode I have set the SYS setting "exceptionalErrors" to 12290, in production mode this setting is set to 4096 (default).

As soon as I change "exceptionalErrors" to 4096 in development mode, the backend module works fine; if I set 12290 again, it crashes again. What could be the reason for this behaviour?

About my environment:

TYPO3 11.5.17
Webserver Apache/2.4.54 (Unix)
PHP 8.1.11
Database MySQL 10.3.28-MariaDB
Application Context Development
Composer-Mode activated
exceptionalErrors 12290 or 28674 do not work
exceptionalErrors 4096 works

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