Access the EFI shell, potentially as "http://stackoverflow.com/a/70191983" describes, or via the UEFI. Access startup.nsh as "https://forums.freebsd.org/threads/startup-nsh.79973/post-507479" describes, or via the UEFI. Modify startup.nsh (this includes what the EFI automatically invokes) to include reset -c -fwui (as "https://sourceforge.net/p/refind/discussion/general/thread/05965d36c2/#ae25" describes) because that command invokes the interface for the firmware. I have not evaluated this. It is mere consolidation of research.

If you do file any bugs on this topic, post your bug numbers here, just for the record. @DTS Engineer, I've posted it at https://feedbackassistant.apple.com/feedback/14937243. However, immediately after doing so, I noticed that the GUI of this forum is conspicuously similar to that of Discourse. Consequently, I expect that this domain is actually a modified version of Discourse, and that this would be better reported upstream. Though, of course, because this instance includes downvotes - which most instances don't - this might irrespective be another useful customisation.

When I click the share button I get a popup menu listing various options. This is with Safari on macOS 13.4.1. @DTS Engineer, indeed. It was probably a bug in Firefox at the time. I see the context menu now: Thank you, and apologies for the superfluous post.

Might an administrator disable the post modification permission timeout for solely this post? I ask because I want to improve a significant amount of its content, so that it's more concise and easily comprehensible. If not, for readers who see this, please merely view https://github.com/nextcloud/contacts/issues/3530#issue-1816825315 instead.