fix: spread embeds failing when using the "count()" aggregate without… #3265

Loadtest Results

param	v12.2.3	head	main
bytes_in.mean	984	985	985
bytes_in.total	27315398	24428363	24579932
bytes_out.mean	3849	3848	3848
bytes_out.total	106895760	95423163	96015780
duration	59999897820	60000260308	60000808249
latencies.50th	968364	966007	961780
latencies.90th	1992835	2063987	2047491
latencies.95th	13842528	16710941	16600103
latencies.99th	14357178	17281848	17150547
latencies.max	25568078	27483919	27492671
latencies.mean	2159720	2418521	2403882
latencies.min	160490	157975	156882
latencies.total	59973271552	59974484683	59976877924
rate	463	413	416
requests	27769	24798	24950
status_codes.200	15147	13527	13610
status_codes.201	5050	4509	4536
status_codes.204	7572	6762	6804
success	1	1	1
throughput	463	413	416
wait	1787957	989119	926621