[Backport release-24.05] Fix `nix flake show --all-systems` from failing #326161

Evaluator Performance Report

stat	before	after	Δ	Δ%
cpuTime	665.25	666.28	↗ 1.03	0.16%
envs-bytes	21,047,370,160	21,047,370,160	0
envs-elements	1,108,300,050	1,108,300,050	0
envs-number	761,310,610	761,310,610	0
gc-heapSize	59,479,404,544	59,479,404,544	0
gc-totalBytes	130,417,440,032	130,417,432,688	↘ 7,344	-0.00%
list-bytes	3,667,113,352	3,667,113,352	0
list-concats	84,004,649	84,004,649	0
list-elements	458,389,169	458,389,169	0
nrAvoided	882,417,340	882,417,340	0
nrFunctionCalls	699,896,697	699,896,697	0
nrLookups	365,637,889	365,637,889	0
nrOpUpdateValuesCopied	1,900,407,426	1,900,407,426	0
nrOpUpdates	86,434,231	86,434,231	0
nrPrimOpCalls	365,256,264	365,256,264	0
nrThunks	1,085,700,171	1,085,700,171	0
sets-bytes	43,103,861,488	43,103,861,488	0
sets-elements	2,531,678,022	2,531,678,022	0
sets-number	162,313,321	162,313,321	0
sizes-Attr	16	16	0
sizes-Bindings	16	16	0
sizes-Env	16	16	0
sizes-Value	24	24	0
symbols-bytes	2,470,550	2,470,550	0
symbols-number	172,402	172,402	0
values-bytes	33,466,634,496	33,466,634,496	0
values-number	1,394,443,104	1,394,443,104	0