Problem creating a relationship between two collections.

I have a total of 27 collections created so far, in which there are relationships between some of them. The problem I have is that when I want to relate the last two collections created I can't do it because when I'm creating an attribute to relate them, regardless of whether I select a unidirectional or bidirectional relationship, it doesn't appear in the list of possible collections. When I filter in the select, the collection I want by entering text appears but it's not selected. It seems that it is because I can click on it and it looks like it's selected, but when I click on the create button, it asks me to select a collection from the list. I read somewhere that I can only create relationships in the first 25 collections. Is this so or did I misunderstand? Is there a solution to my problem? I'm using Appwrite locally and I'm running version 1.5.5 right now.