Semantic highlighting remains active after setting is turned off

[JosephTLyons]

Reproduction steps

1. Open a rust file with code in the doc comments with "semantic_tokens": "off"

2. Switch to "semantic_tokens": "combined" and notice highlighting is applied

3. Switch to "semantic_tokens": "off" and notice highlighting remains

4. File must be closed and reopened to clear highlighting

Current vs. Expected behavior

Current: Semantic highlighting sticks around after setting has been disabled while file is open
Expected: Semantic highlighting is removed immediately on settings change

Zed version and system specs

Zed: v0.225.0+nightly.2178.ceec6ee5f52b9c0dde5d30616b15cea2316d4857 (Zed Nightly ceec6ee)
OS: macOS 26.2
Memory: 64 GiB
Architecture: aarch64

Attach Zed log file

Zed.log

Relevant Zed settings

settings.json

Relevant Keymap

keymap.json

(for AI issues) Model provider details

No response

If you are using WSL on Windows, what flavor of Linux are you using?

None