BUG #17716: walsender process hang while decoding 'DROP PUBLICATION' XLOG

The following bug has been logged on the website:

Bug reference:      17716
Logged by:          bowenshi
Email address:      zxwsbg12138@gmail.com
PostgreSQL version: 13.9
Operating system:   centos
Description:

Dears, I have found a problem while using logical decoding.  I have two
publications, and the walsender process hang while decoding DROP PUBLICATION
XLOG of another publication. The pstack looks like following:

#0  0x00000000008b9c24 in hash_seq_search ()
#1  0x00007fd14340590c in rel_sync_cache_publication_cb () from
pgoutput.so
#2  0x0000000000897a1a in CallSyscacheCallbacks ()
#3  0x000000000073682e in ReorderBufferCommit ()
#4  0x000000000072b988 in DecodeXactOp ()
#5  0x000000000072bd52 in LogicalDecodingProcessRecord ()
#6  0x000000000074d14f in XLogSendLogical ()
#7  0x000000000074f562 in WalSndLoop ()
#8  0x0000000000750322 in exec_replication_command ()
#9  0x0000000000792301 in PostgresMain ()
#10 0x000000000048854f in ServerLoop ()
#11 0x000000000071b579 in PostmasterMain ()
#12 0x000000000048948d in main ()

When I user perl to analyze, it spend almost 99% time in `hash_seq_search`
function.

This problem can be reproduced , and I will send the shell script later.