Fix crash on iOS when resuming download task.

[bofeng-song]

Re: #
https://forum.cocos.org/t/topic/174258

Changelog

---

Continuous Integration

This pull request:

• needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

---

Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.

[github-actions]

Code Size Check Report

Wechat (WASM)	Before	After	Diff
2D Empty (legacy pipeline)	1010366 bytes	1010366 bytes	✅ 0 bytes
2D All (legacy pipeline)	2676058 bytes	2676058 bytes	✅ 0 bytes
2D All (new pipeline)	2767796 bytes	2767796 bytes	✅ 0 bytes
(2D + 3D) All	10024822 bytes	10024822 bytes	✅ 0 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16844473 bytes	16844473 bytes	✅ 0 bytes

Interface Check Report

This pull request does not change any public interfaces !

[star-e]

@cocos-robot run-test-cases-custom

[github-actions]

@bofeng-song, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v4.0.0
• Task Result: FAIL
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/da2311e6-1121-4f20-a951-3e73a95a16e9/-1
• GitHub Action: https://github.com/cocos/cocos4/actions/runs/22477472671

Task Details

Platform	build	boot	runned	crashScene	FailScene
web-mobile	PASS	PASS	FAIL		particle-compare,BuildTimeConstantsTest,tween-clone
ios	PASS	PASS	FAIL		particle-compare,BuildTimeConstantsTest
mac	PASS	PASS	FAIL		particle-compare,BuildTimeConstantsTest

[github-actions]

@bofeng-song, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v4.0.0
• Task Result: FAIL
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/da99d543-1ab5-4071-9655-92cd7a9c946b/-1
• GitHub Action: https://github.com/cocos/cocos4/actions/runs/22477472671

Task Details

Platform	build	boot	runned	crashScene	FailScene
windows	PASS	PASS	FAIL		particle-compare,BuildTimeConstantsTest
android	PASS	PASS	FAIL		particle-compare,BuildTimeConstantsTest
wechatgame	PASS	FAIL	FAIL

[github-actions]

@bofeng-song ❗ There was an error during the execution of the tasks. Please check the logs for more details.