Issue of loading .env variables (Laravel 11.9)

[t-poeschl]

Strangely enough, we occasionally have the problem that after a deploy to Laravel Forge, the variables from the .env can still be loaded at the beginning and suddenly 1-2 days later no longer or then the following error occurs:

TypeError: JiraCloud\Configuration\AbstractConfiguration::getJiraHost(): Return value must be of type string, null returned in /home/forge/------/vendor/lesstif/jira-cloud-restapi/src/Configuration/AbstractConfiguration.php:93
Stack trace:
#0 /home/forge/------/vendor/lesstif/jira-cloud-restapi/src/JiraClient.php(400): JiraCloud\Configuration\AbstractConfiguration->getJiraHost()
#1 /home/forge/------/vendor/lesstif/jira-cloud-restapi/src/JiraClient.php(191): JiraCloud\JiraClient->createUrlByContext()
#2 /home/forge/------/vendor/lesstif/jira-cloud-restapi/src/Issue/IssueService.php(506): JiraCloud\JiraClient->exec()

Is the problem known?