BUG #17393: Delete database after recovery with point-in-time is still missing datafiles

The following bug has been logged on the website:

Bug reference: 17393
Logged by: Christopher Lorenz
Email address: christopher(dot)lorenz(at)zit-bb(dot)brandenburg(dot)de
PostgreSQL version: 14.1
Operating system: RHEL 7, RHEL 8, Ubuntu
Description:

Hello,

a recovery from a basebackup and PIT-recovery after a acccedently DROP
DATABASE before the deletion, the database is listed in list of database,
but if I try to connect, the files and directory for that database are
missing.

Reproduce:
0. configure postgresql to backup pg_wal
1. Create a database (e.g. test)
2. make a backup with pg_basebackup
3. save the current timestamp (at 14:01:31)
4. drop the database (at 14:01:37)
5. Save all pg_wal with pg_switch_wal()
6. Restore the basebackup to $PGDATA
7. Starting point in time recovery to 14:01:31
8. Wait and check the database
a. database is show with \l in psql => OK
b. connection shows error that the directory in PGDATA/base is missing =>
Not OK

Expected:
Recovery stops before DROP DATABASE command. The list of database shows my
delete database and all files are existing as in given PIT timestamp.

Logfile:
2022-02-03 14:01:47.073 CET [5526] LOG: starting point-in-time recovery to
2022-02-03 14:01:31+01
2022-02-03 14:01:47.093 CET [5526] LOG: restored log file
"000000010000000000000002" from archive
2022-02-03 14:01:47.148 CET [5526] LOG: redo starts at 0/2000028
2022-02-03 14:01:47.156 CET [5526] LOG: consistent recovery state reached
at 0/2000100
2022-02-03 14:01:47.156 CET [5524] LOG: database system is ready to accept
read only connections
2022-02-03 14:01:47.175 CET [5526] LOG: restored log file
"000000010000000000000003" from archive
2022-02-03 14:01:47.224 CET [5526] LOG: recovery stopping before commit of
transaction 486, time 2022-02-03 14:01:37.011667+01
2022-02-03 14:01:47.224 CET [5526] LOG: pausing at the end of recovery
2022-02-03 14:01:47.224 CET [5526] HINT: Execute pg_wal_replay_resume() to
promote.
2022-02-03 14:01:52.199 CET [5546] FATAL: database "test" does not exist
2022-02-03 14:01:52.199 CET [5546] DETAIL: The database subdirectory
"base/16384" is missing.

Steps in script:
psql -c 'CREATE DATABASE test'
# basebackup
pg_basebackup -D $backup_dir/0
sleep 5
rec_pit=`date +'%Y-%m-%d %H:%M:%S'`
sleep 5
# drop db
psql -c 'DROP DATABASE test'
# save backup
psql -c 'SELECT pg_switch_wal()'
sleep 5
# Stop db
pg_ctl -D $PGDATAstop
# recovery
rm -rf $PGDATA/*
cp -r $backup_dir/0/* $PGDATA/
touch $PGDATA/recovery.signal
echo "recovery_target_time='$rec_pit'" >> $inst_dir/postgresql.conf
# start
pg_ctl -D $PGDATA -l ${log_dir}/pgsql.log start
sleep 5
echo "\c test" | psql

Notes:
- Before stating the database and recovery process the files in base
exists
- I also have the same behaviour In version 12 to 14