Combined IR remote not working

I tried to make one universal remote by copying together buttons from two different remotes.
When I just tested this with the POWER button from both remotes, that worked.

When I do that with all the buttons I need, the Flipper behaves as if the remote was empty. I have no idea why. My first assumption was that I can’t mix protocols (raw and NECext in the same file), but that seems to be working with just two buttons.

Does anyone have any idea why this IR file just comes up empty on the Flipper? (2.9 KB)
It’s just copied together from two working remotes; and the flipper debug log doesn’t show any error messages either while opening this remote.