Hi @bajgproton0731 ,
First check your log entries if there is any error mentioned in [Magento_Root]/var/log/exception.log
Can you please try some troubleshooting steps to check exact issue.
1. First try to replace block code with below code to check
<block class="Magento\Framework\View\Element\Template" name="redirectionblock" template="Vendor_Module::block.phtml" />
try to add a single line of code in your phtml file and flush cache. Check still you face container disappear issue or not.
2. If issue not occurring then try to replace block class name with your class. And check the issue again,
Thanks!
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