[MC-225133] The pause on lost focus setting is overridden inconsistently

Even though there is a toggleable setting (F3+P), GUIs being open inconsistently override the pause on lost focus setting. This means that if you have pause on lost focus turned on, the game will sometimes not pause on lost focus regardless. What is the point of a setting if a large part of the gameplay overrides a setting?

Note that this is only for singleplayer. For multiplayer, the setting is obsolete.

The list may be incomplete:

GUI	Obeys pause on lost focus being turned on	Obeys pause on lost focus being turned off*
No GUI
Sign	It used to, but it is broken as of 23w12a.	(~~MC-261292~~)
Book		No, but that's intended
Command block		No, but that's intended
Structure block	See MC-112580.	Yes, but it shouldn't. (MC-112580)
Lectern
Containers
Inventory
Villager trading
Sleeping in a bed
Chat
Non-container blocks that have GUIs (e.g. crafting table)
Being in a nether portal	Used to not work, but now it does. (~~MC-2071~~)
Beacons

*This is not the bug, this column is just for comparisons.

Some of these seem more important than others. The inconsistency between lecterns and books sticks out particularly.

Being in a nether portal is not an issue, but was included to bring up the fact that this was once considered a valid issue and was fixed.

Note

The issue is NOT that the game doesn't pause when in the mentioned instances. The issue is that the game doesn't pause when the game is tabbed out of in the mentioned instances.

This may be intended.