Failed to paste more than 2035 characters with libwebsockets >= 4.4.0

Describe the bug With Docker image tsl0922/ttyd:1.7.8, whenever I try to paste more than 2035 characters it just reconnect.

To Reproduce Steps to reproduce the behavior:

1. Just paste more than 2035 characters.
2. See error

[2026/04/24 18:21:38:8866] E: [wsisrv|1|default|(null)|127.0.0.1]: lws_extension_callback_pm_deflate: rx buffer underflow

Expected behavior It worked fine on 1.7.7.

Screenshots If applicable, add screenshots to help explain your problem.

Environment:

• OS: Windows, Linux
• Browser: Chrome, Firefox

Additional context It seems to be related to this commit: https://github.com/warmcat/libwebsockets/commit/6a2542ded78ec41395a256dc20976ec2800d357b If I undo the commit or just build with a version (4.3.10 for example) without the commit, I can once again paste very-long text like in 1.7.7.