SQL*Plus screen size causes column heading alignment issue - oracle

Question

When the SQL*Plus column headings line exceeds the PowerShell screen buffer size (in this case) by 4 or more, the window wraps the column heading line with the incorrect number of spaces.
This causes the column heading to not align with the values.
I get the same result regardless if set trim on or set trim off.
I get the same result regardless if set wrap on or set wrap off.
Is this a bug in PowerShell, Oracle InstantClient, or am I using SQL*Plus incorrectly?
Using Oracle 19c Enterprise Edition, Oracle InstantClient 19c 64-bit, Windows PowerShell Desktop 5.1.19041.1320, Microsoft Windows 10.0 build 19042.
PowerShell screen buffer size of 31. Column heading B is aligned with its data.
SQL> create table wrap (a varchar2(20), b varchar2(10));
Table created.
SQL> insert into wrap (a, b) values ('12345678901234567890', 'abcdefghij');
1 row created.
SQL> commit;
Commit complete.
SQL> set linesize 31
SQL> select * from wrap;
A B
-------------------- ----------
12345678901234567890 abcdefghij
PowerShell screen buffer size of 17. There are 16 spaces after column heading A and 0 spaces after column heading B. Column heading B is aligned with its data.
SQL> select * fro
m wrap;
A
B
-----------------
--- ----------
12345678901234567
890 abcdefghij
PowerShell screen buffer size of 16. There are 0 spaces after column heading A and 2 spaces after column heading B. Column heading B is not aligned with its data.
SQL> select * fr
om wrap;
A
B
----------------
---- ----------
1234567890123456
7890 abcdefghij
PS C:\> $PSVersionTable
Name Value
---- -----
PSVersion 5.1.19041.1320
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.19041.1320
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
Thank you in advance.