The first one isn't possible, as you can't have a worldborder be smaller than 1 block. The last two are also not possible.
Otherwise, I can confirm.
Can confirm as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
This behaviour is no longer present in 1.19/1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Still an issue as of 1.19.1
Can reproduce.
Additionally, I suggest building a redstone clock connected to a command block (/summon husk ~ ~ ~ {Health:0f}) to make testing easier.
The cause for the un-translated message in the options menu is a disparity between the translation key and the name used in game. If you go into the language files, or the Crowdin project, you will find that the key for this translation is options.autoSuggestCommands, whereas the one used in-game is options.autoSuggestCommand, missing an 's'. I think this issue could be easily solved by addressing this typo.
Can confirm