[BUG] Strange context bloat and truncation #11990

Problem (one or two sentences)

Lately I'm getting problems with strange context bloat that is not related to actual prompt (I have experienced it even on empty project folder and in the beginning of the prompt session). I have only noticed it by increase token consumption (=costs) and context truncation messages, which look like the truncated context is larger than the original context:

Context (who is affected and when)

I have experienced it in Architect and Code roles, during sessions and even in the beginning of the prompt session. I haven't yet figured out the pattern.

Reproduction steps

I have not yet figured out clear reproduction pattern.

Expected result

Actual result

Variations tried (optional)

No response

App Version

3.51.1 (7c9722b)

API Provider (optional)

OpenRouter

Model Used (optional)

openai/gpt5.1-codex, openai/gpt5.3-codex

Roo Code Task Links (optional)

No response

Relevant logs or errors (optional)