HTTP/2 protocol error if headers are sent before a Lua error

Relevant section of the OpenResty 1.19.9.1 config:

location @error {
	content_by_lua_file /var/www/lua/error.lua;
}

location / {
	error_page 500 @error;
	content_by_lua_file /var/www/lua/content.lua;
}

error.lua:

ngx.say(tostring(ngx.status))

content.lua:

ngx.send_headers()
error('hi')

Trying to curl https://localhost results in:

curl: (92) HTTP/2 stream 0 was not closed cleanly: INTERNAL_ERROR (err 2)

curl https://localhost --http1.1 (or --http1.0):

curl: (52) Empty reply from server

Commenting out the call to ngx.send_headers() results in the request completing successfully and printing 500.

Using echo instead of content_by_lua* in the @error named location doesn't solve the issue.

Reproduce the configuration using content.lua and error.lua, starting with the ngx.send_headers() and error('hi') sequence and the @error location. Compare the HTTP/2 and HTTP/1.x curl results; done means the request reaches the error handler and returns 500 without an INTERNAL_ERROR or empty reply.