BUG #16711: Access violation exception when call procedure

The following bug has been logged on the website:

Bug reference:      16711
Logged by:          Dmitry Vasilyev
Email address:      dcb.bandos@gmail.com
PostgreSQL version: 13.0
Operating system:   Windows 10
Description:

I have a procedure:
CREATE OR REPLACE PROCEDURE TestingRollbackProc(_id uuid, _title text)
 AS $$
 begin
     INSERT INTO testtable values(_id, _title);
     ROLLBACK;
 end 
 $$ language plpgsql;

When I've called this procedure(Npgsql 4.1.4) I got an Access violation
0xC0000005 exception

call TestingRollbackProc(uuid_generate_v4(), 'asdf')

2020-11-11 14:33:13.873 CET [6800] LOG:  server process (PID 34208) was
terminated by exception 0xC0000005
2020-11-11 14:33:13.873 CET [6800] DETAIL:  Failed process was running: CALL
"testingrollbackproc"($1,$2)
2020-11-11 14:33:13.873 CET [6800] HINT:  See C include file "ntstatus.h"
for a description of the hexadecimal value.
2020-11-11 14:33:13.875 CET [6800] LOG:  terminating any other active server
processes
2020-11-11 14:33:13.877 CET [42964] WARNING:  terminating connection because
of crash of another server process
2020-11-11 14:33:13.877 CET [42964] DETAIL:  The postmaster has commanded
this server process to roll back the current transaction and exit, because
another server process exited abnormally and possibly corrupted shared
memory.
2020-11-11 14:33:13.877 CET [42964] HINT:  In a moment you should be able to
reconnect to the database and repeat your command.
2020-11-11 14:33:13.877 CET [5356] WARNING:  terminating connection because
of crash of another server process
2020-11-11 14:33:13.877 CET [5356] DETAIL:  The postmaster has commanded
this server process to roll back the current transaction and exit, because
another server process exited abnormally and possibly corrupted shared
memory.
2020-11-11 14:33:13.877 CET [5356] HINT:  In a moment you should be able to
reconnect to the database and repeat your command.

call stack:
>    postgres.exe!PortalRunMulti(PortalData * portal, bool isTopLevel, bool
setHoldSnapshot, _DestReceiver * dest, _DestReceiver * altdest,
QueryCompletion * qc) Line 1319    C
     postgres.exe!PortalRun(PortalData * portal, long count, bool isTopLevel,
bool run_once, _DestReceiver * dest, _DestReceiver * altdest,
QueryCompletion * qc) Line 783    C
     postgres.exe!exec_execute_message(const char * portal_name, long max_rows)
Line 2203    C
     postgres.exe!PostgresMain(int argc, char * * argv, const char * dbname,
const char * username) Line 4378    C
     [Inline Frame] postgres.exe!BackendRun(Port *) Line 4536    C
     postgres.exe!SubPostmasterMain(int argc, char * * argv) Line 5059    C
     postgres.exe!main(int argc, char * * argv) Line 198    C
     [Inline Frame] postgres.exe!invoke_main() Line 78    C++
     postgres.exe!__scrt_common_main_seh() Line 283    C++
     kernel32.dll!BaseThreadInitThunk()    Unknown
     ntdll.dll!RtlUserThreadStart()    Unknown

pquery.c:
/*
         * Increment command counter between queries, but not after the last
         * one.
         */
        if (lnext(portal->stmts, stmtlist_item) != NULL)
            CommandCounterIncrement();

portal->stmts is nullptr