Full partition scan

--Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
--Version 19.9.0.0.0

CREATE TABLE dropme_t (pkey, val)
partition BY range(pkey) INTERVAL(1)
(partition p0 VALUES less than(0) segment creation deferred)
AS SELECT rownum*10000, rpad('val'||(rownum*10000),2000) FROM dual CONNECT BY level < 100
;

DECLARE l_pkey INT := 10000;
BEGIN
    INSERT /*+ MONITOR */ INTO dropme_t SELECT * FROM dropme_t WHERE pkey = l_pkey;
END;
/

Binds
========================================================================================================================
| Name | POSITION |  TYPE  |                                           VALUE                                           |
========================================================================================================================
| :B1  |        1 | NUMBER | 10000                                                                                     |
========================================================================================================================

SQL Plan Monitoring Details (Plan Hash VALUE=3888867286)
===================================================================================================================================
| Id |         Operation         |   Name   |  ROWS   | Cost |   TIME    | START  | Execs |   ROWS   | Activity | Activity Detail |
|    |                           |          | (Estim) |      | Active(s) | Active |       | (Actual) |   (%)    |   (# samples)   |
===================================================================================================================================
|  0 | INSERT STATEMENT          |          |         |      |         1 |     +0 |     1 |        0 |          |                 |
|  1 |   LOAD TABLE CONVENTIONAL | DROPME_T |         |      |         1 |     +0 |     1 |        0 |          |                 |
|  2 |    PARTITION RANGE SINGLE |          |       1 |    7 |         1 |     +0 |     1 |        1 |          |                 |
|  3 |     TABLE ACCESS FULL     | DROPME_T |       1 |    7 |         1 |     +0 |  ==>1 |        1 |          |                 |
===================================================================================================================================



DECLARE l_pkey INT := 2000000; -- Out of allowed interval partitions range
BEGIN
    INSERT /*+ MONITOR */ INTO dropme_t SELECT * FROM dropme_t WHERE pkey = l_pkey;
END;
/

Binds
========================================================================================================================
| Name | POSITION |  TYPE  |                                           VALUE                                           |
========================================================================================================================
| :B1  |        1 | NUMBER | 10000                                                                                     |
========================================================================================================================

SQL Plan Monitoring Details (Plan Hash VALUE=3888867286)
===================================================================================================================================
| Id |         Operation         |   Name   |  ROWS   | Cost |   TIME    | START  | Execs |   ROWS   | Activity | Activity Detail |
|    |                           |          | (Estim) |      | Active(s) | Active |       | (Actual) |   (%)    |   (# samples)   |
===================================================================================================================================
|  0 | INSERT STATEMENT          |          |         |      |           |        |     1 |          |          |                 |
|  1 |   LOAD TABLE CONVENTIONAL | DROPME_T |         |      |           |        |     1 |          |          |                 |
|  2 |    PARTITION RANGE SINGLE |          |       1 |    7 |           |        |     1 |          |          |                 |
|  3 |     TABLE ACCESS FULL     | DROPME_T |       1 |    7 |           |        |==>100 |          |          |                 |
===================================================================================================================================