Hide icon not showing

After placing some bodies in a sub folder the hide body eye icon does not appear, only for the whole folder. And in other folders only one body has the eye icon and not others.

I want to be able to hide or unhide specific bodies but it seems randomly disabled for some of these.

Am I doing something wrong or is this a bug?

Update - after quitting and reopening the icons have reappeared, so it seems to be a bug, at least with my computer. Version 5.562.0 (6543)