3354684 - Error: 8201, Severity: 26, State: 6 - after adding new indexes - SAP ASE

kernel  Cannot send, host process disconnected: server.com 137724 suid: 1305
server  Error: 21, Severity: 26, State: 1
server  WARNING - Fatal Error 8201 occurred at Jul 11 2023  5:34AM.  Please note the error and time, and contact a user with System Administrator (SA) authorization.
server  Error: 8201, Severity: 26, State: 6
server  Keep count of descriptor (objid=476525700, dbid=71) was expected to be 1. Instead 0 was found.
kernel  Cannot send, host process disconnected: server.com 137724 suid: 1305

Error message is followed by stack with:
pcstkwalk
ucstkgentrace
ucbacktrace
terminate_process
hdl_default
s_handle
exc__raise
exc_raise
des__unkeep
des_unkeep_or_drop+0xf
closetable+0x371()
close_range+0x166()
LePlanRelease+0x4de()
0001d12ee0 le_execerr 
exec_lava+0x6b6()
curs_clean+0x8c()
curs_close+0x88()
s_handle+0x948()
exc__raise+0x48d()
pc: 0x0000000001628144 LeEmitSndOp::_LeOpNext(ExeCtxt
pc: 0x000000000160055a LePlanNext+0xea()
[Handler pc: 0x0x0000000001d12ee0 le_execerr installe
pc: 0x0000000001d14518 exec_lava+0x688()
pc: 0x0000000001d6a7d2 curs_fetch+0xf2()
pc: 0x0000000001da63f2 s_execute+0x3292()
[Handler pc: 0x0x0000000001e05760 hdl_stack installed
[Handler pc: 0x0x0000000001dcb940 s_handle installed 
pc: 0x0000000001dcfd0c sequencer+0xcbc()
pc: 0x00000000015e1c4a tdsrecv_fetch+0x16a()
[Handler pc: 0x0x0000000001f0b4b0 ut_handle installed
pc: 0x00000000015f706d conn_hdlr+0x16ad()
end of stack trace, spid 31330, kpid 482568373, suid 
ASE is terminating this process.

SAP Adaptive Server Enterprise (ASE) 16.0                                                                                                                                                           

KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Known Error