Loading full issue by url hangs

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I have some issues which never load when opened directly by url. So if I open the issue directly by url (e.g. directly from e-mail), like

https://git.address.com/path/to/project/-/issues/5

it never finishes loading and I only see the the description, but no comment box and spinners on the right side:

Bildschirmfoto_2025-10-06_um_09.47.04

Browser console does not display any javascript error.

It works if I go to the issue list and open the issue in the popover (which slides in from the right side) and it works if I click on the arrows to open it then. But if I reload the page while in full view it hangs again.

Self hosted Gitlab omnibus 18.4.1-ee.0
Teste with Firefox and Chrome

Edited by 🤖 GitLab Bot 🤖