Bug Description

Internal <think> thinking tags are being leaked to the user in Telegram messages instead of being filtered out internally.

Steps to Reproduce

1. Use OpenClaw with any model that has thinking/reasoning enabled
2. Wait for the model to generate internal thoughts
3. The <think> tags and their content appear in the Telegram message to the user

Expected Behavior

Internal thinking tags should be filtered out before the message is sent to the user. The user should not see any <think> or </think> tags or their content.

Environment

• OpenClaw version: 2026.4.20
• Channel: Telegram
• Model: minimax/MiniMax-M2.7 (and other models)

Additional Context

This appears to be a rendering/filtering issue where the thinking tags that should be internal to the model are being exposed to the end user. The issue was present in previous versions and persists after upgrading to 2026.4.20.