Segmentation fault CASE WHEN with DO block

[DenSaoPin]

When using the CASE WHEN expression in the body of the function that is used in the DO block, a segmentation error occurs.
If you call with a simple parameter in the DO block, then the error is not observed.
There is no such error in pure postgresql.
I have checked several versions of citus and this problem has been observed everywhere.

Example:

CREATE OR REPLACE FUNCTION public.test_err(v1 text)
 RETURNS text
 LANGUAGE plpgsql
 SECURITY DEFINER
AS $function$

begin
  return v1 || ' - ok';
END;
$function$;
do $$ declare 
 lNewValues text;
 val text;
begin 
 val = 'test';
 lNewValues = public.test_err(v1 => case when val::text = 'test'::text then 'yes' else 'no' end);
 raise notice 'lNewValues= %', lNewValues;
end;$$ ;

Short log:

14:11:30.082 [2673] LOG:  server process (PID 14341) was terminated by signal 11: Segmentation fault
14:11:30.082 [2673] DETAIL:  Failed process was running: do $$ declare 
     lNewValues text;
     val text;
    begin 
     val = 'test';
     lNewValues = public.test_err(v1 => case when val::text = 'test'::text then 'yes' else 'no' end);
    
     raise notice 'lNewValues= %', lNewValues;
    end;$$ ;
14:11:30.082 [2673] LOG:  terminating any other active server processes
14:11:30.083 [14185] LOG:  could not receive data from client: Connection reset by peer
14:11:30.086 [14343] FATAL:  the database system is in recovery mode
14:11:30.087 [2673] LOG:  all server processes terminated; reinitializing
14:11:30.123 [14344] LOG:  database system was interrupted; last known up at 13:51:57 
14:11:30.136 [14344] LOG:  database system was not properly shut down; automatic recovery in progress
14:11:30.138 [14344] LOG:  redo starts at 2/BA198838
14:11:30.138 [14344] LOG:  invalid record length at 2/BA198870: wanted 24, got 0
14:11:30.138 [14344] LOG:  redo done at 2/BA198838 system usage: CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.00 s
14:11:30.146 [14345] LOG:  checkpoint starting: end-of-recovery immediate wait
14:11:30.152 [14345] LOG:  checkpoint complete: wrote 3 buffers (0.0%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.002 s, sync=0.001 s, total=0.007 s; sync files=2, longest=0.001 s, average=0.001 s; distance=0 kB, estimate=0 kB
14:11:30.163 [2673] LOG:  database system is ready to accept connections
14:11:31.161 [7821] WARNING:  111:5432:SELECT waiting_pid, waiting_node_id, waiting_transaction_num, waiting_transaction_stamp, blocking_pid, blocking_node_id, blocking_transaction_num, blocking_transaction_stamp, blocking_transaction_waiting FROM dump_local_wait_edges() 
14:11:31.161 [7821] CONTEXT:  Citus maintenance daemon for database 244221 user 10
14:11:31.161 [7821] WARNING:  SSL SYSCALL error: EOF detected
14:11:31.161 [7821] CONTEXT:  while executing command on 127.0.0.1:5432