Unable to retrieve custom TLS extension in OpenResty

Environment
OpenResty Version: openresty/1.27.1.2

Problem

The Lua API ngx.ssl.clienthello.get_client_hello_ext(0x4D59) always returns nil, even though:
Wireshark confirms the extension 0x4D59 is present in the Client Hello's "Outer Extensions" section.

Standard extensions (e.g., SNI type 0) are retrieved successfully using the same API.

Configuration Snippet:

ssl_client_hello_by_lua_block {  
  local ssl_clt = require "ngx.ssl.clienthello"  
  local custom_ext = ssl_clt.get_client_hello_ext(0x4D59)  -- Always nil  
  if custom_ext then  
    ngx.log(ngx.INFO, "Got extension 0x4D59")  
  else  
    ngx.log(ngx.INFO, "Extension 0x4D59 not found")  -- Always triggered  
  end  

Log Output:
Extension 0x4D59 not found

Start with ngx.ssl.clienthello.get_client_hello_ext as used in ssl_client_hello_by_lua_block, and compare handling of extension 0x4D59 with the working SNI lookup. Reproduce the request using the OpenResty 1.27.1.2 configuration and confirm that the custom extension is present in the Client Hello's Outer Extensions section. Done means the API retrieves 0x4D59 while standard extensions continue to work.