Non-thinking mode primes a "final" channel, so the Gemma 4 tokenizer decodes
that channel's close marker to a bare </think> with no opening tag. Splitting on
the last </think> then kept everything after it, which is nothing: the node
output an empty string, blanking both Preview Any and the positive conditioning
it feeds in the Text to Video (LTX-2.5) template.
Fall back to the text before the unmatched close, and to the user prompt when
nothing usable is left, which is what both system prompts already ask for.
bymyself