Hover enrichment not working, but no problem with "Enrich event" functionality

OS : CentOS 8
Instance behind a corporate Proxy
PHP 7.4.22
MISP 2.4.148

Hi, I've had a few problems with the misp-modules, mainly that the misp-modules service initially works fine right after the install but refuses to start again after a reboot. This is what I have as a result :

Any attempt at restarting/stopping the service has failed.

This resulted is no plugins being available. I have gone around this by manually launching the modules (with help from issue #354) :

sudo -u apache /var/www/MISP/venv/bin/misp-modules -l 127.0.0.1 -s

The output indicates that all modules were succesfully loaded. In the UI, the plugin settings appear and I can use "Enrich event", for example to generate yara rules from hash values. This works fine. However, as soon as I try using hover enrichment on a single attribute, I only get errors :

In the python logs, I see the following :

I'm not sure what else I can do to fix this, I didn't have this problem when I tested the install on my personal computer so I don't know if this is somehow related to the proxy. I'd be grateful if anyone has any idea on this one. Mainly, how is it that I get results when I enrich the entire event with "Enrich Event" but the single hover enrichment for one attribute doesn't work ?

Thank you !

Use the manually launched misp-modules -l 127.0.0.1 -s command as the starting entry point, and compare it with the misp-modules service after reboot on CentOS 8. Review the reported Python logs and hover-enrichment behavior; done means the service starts reliably and single-attribute hover enrichment works while event enrichment remains functional.