Hidden item limits for Island Sanctuary?

[Jojoya]

I'm working on decorating one of my islands.

I've got 6 Oriental Grass Plots placed. If try to place another, I get the "You cannot place any more of that outdoor furnishing" error message.

I've got 4 Lupin Plots placed. Again, I get the error message if I try to place a 5th.

I have no Sunflower Plots placed. I still get the error message if I try to place one.

On the other hand, I have 12 Dohn Trellis placed and i don't seem to have an issue placing as many as I want (I stopped at 35 while experimenting).

Anyone else having issues with hitting placement limits with specific item types on Island Sanctuary? I'm submitting this as a bug but I'd like to know if others are having similar issues with the same or other types of items.

edit: thank you to those who pointed out the message on the tooltip I had overlooked. I guess it now should be feedback to have the limitation removed considering we don't have similar restrictions on outdoor items outside of "trophy" furnishings.