/compact reduced context availability by 70%

What version of Codex is running?

0.80.-alpha.3

What subscription do you have?

Internal

Which model were you using?

gpt-5.2-codex

What platform is your computer?

_No response_

What issue are you seeing?

I had 80% context window left. I ran /compact. Now I had 10% context window left.

What steps can reproduce the bug?

Uploaded thread: 019b9b12-e691-72c3-a588-5640c3f8b9a3

What is the expected behavior?

/compact increases context availability, not reduces it.

Additional information

_No response_