I also confirmed this behavior on Firefox 120 on Windows.
Here is a reblog chain where the first post has a CW headline and hidden text, and then the reply also has a CW headline and hidden text. The text in the first post is being shown rather than hidden by the Show More.
Browser: Orion OS: MacOS
I also confirmed this behavior on Firefox 120 on Windows.
Here is a reblog chain where the first post has a CW headline and hidden text, and then the reply also has a CW headline and hidden text. The text in the first post is being shown rather than hidden by the Show More.
The same post on Mastodon.