timezone info unavailable in builds with small ICU

[aduh95]

Version

main

Platform

Subsystem

No response

What steps will reproduce the bug?

nix-shell --argstr icu small --arg withTemporal true --arg devTools '[]' --arg benchmarkTools '[]' --run 'make build-ci -j8'
./node -e 'assert.strictEqual(Temporal.Instant.from("1969-07-20T20:17:00Z").toString(), "1969-07-20T20:17:00Z")'

How often does it reproduce? Is there a required condition?

small ICU with Temporal

What is the expected behavior? Why is that the expected behavior?

Temporal.Instant.from("1969-07-20T20:17:00Z").toString() should output the input string

What do you see instead?

assert.strictEqual(Temporal.Instant.from("1969-07-20T20:17:00Z").toString(), "1969-07-20T20:17:00Z")
                                                                 ^

Error: Temporal error: Internal error: Failed to load timezone info.
    at Instant.toString (<anonymous>)
    at [eval]:1:66
    at runScriptInThisContext (node:internal/vm:219:10)
    at node:internal/process/execution:485:12
    at [eval]-wrapper:6:24
    at runScriptInContext (node:internal/process/execution:483:60)
    at evalFunction (node:internal/process/execution:317:30)
    at evalTypeScript (node:internal/process/execution:329:3)
    at node:internal/main/eval_string:71:3

Node.js v27.0.0-pre

Additional information

Refs: #62676

According to @srl295, this is due to how ICU compute length: it compares the position of the item and the position of the next item; in this case, Zoneinfo64 is the last item, so there are no "next item" to compute the length so it assumes it's empty and throws.