Gemma 4 31B silently stops reasoning on complex prompts.

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<!-- SC_OFF --><div class="md"><blockquote> <p>Wait, I need to be careful about the &quot;no_think&quot; tag in the system prompt. The system prompt says <code>/no_think</code>.

<!-- SC_OFF --><div class="md"><p>I like to be able to enable and disable thinking using a system prompt, so that I can control what which prompts generate thinking tokens rather

<!-- SC_OFF --><div class="md"><p>question, I'm using it for text translations and on each large prompt (20K+) it stops with a remark 'now I'm going to put that to the file' or

<!-- SC_OFF --><div class="md"><p>Even the trick of editing the reply with the tag &lt;think&gt; or &lt;|think|&gt; doesn't do anything for me. On some models I used to be able to