Real simple one I noticed recently is the ^ doesn't show in autofill suggestions like ~ without one being typed. For example, autofill suggests the following options:

/tp (@a, @e, @p, @r, @s, name, ~, ~ ~, ~ ~ ~)

However, upon typing a single ^, I get the carets suggested to me. I don't know if this is intended, but I honestly wouldn't know the ^ symbol could be used if I hadn't seen a YouTube video about it when it came out. I think it should be suggested.