TYPO3 Core

Hi, I notice some strange behaviour when trying to add some custom styles in yaml file.

These lines work fine:

- { name: "My Style", element: "code", attributes: { class: "one"} }
      - { name: "My Style", element: "code", attributes: { class: "one two"} }
      - { name: "My Style", element: "code", attributes: { class: "one three two"} }

while there lines cause problems (the style "My Style" does not appear in list):

- { name: "My Style", element: "code", attributes: { class: "one two three"} }
      - { name: "My Style", element: "code", attributes: { class: "two one three"} }
      - { name: "My Style", element: "code", attributes: { class: "three two one"} }

I always tested one line of course. It's in TYPO3 9.5.7. In previous versions it works.