This support ticket is created vor 6 Jahre, 3 Monate. There's a good chance that you are reading advice that it now obsolete.
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The code looks a little confused, if I may say so, you are adding the same filter twice and have a spurious apply_filters call which appears to do nothing.
Sorry, these posts are being created on the back-end. I've just unchecked Title in the CPT configuration screen. So when I enter one, it saves with no title.
The code I used was from someone else's similiar issue. I guess it has too many values in it. Can you provide me with the code needed to use the custom fields Owner-First-Name and Owner-Last-Name to successfully create a post title for my CPT of Owners.
I wrote some code that you can try below, but please note that providing or debugging custom code falls outside of our support policy, so I'm providing as-is, I haven't tested it, but I think it should do what you need, and I think it is fairly straightforward to follow the logic.