Native SIGSEGV in libunity.so Curl_splaygetbest / curl_multi_perform under concurrent UnityWebRequest churn

Reproduction steps:

1. Open the attached “IN-145253“ project
2. (Optional) In the Build Settings, enable “Development Build”
3. Build and Run the Android Player
4. Observe the Crash

Reproducible with: 6000.3.0a5, 6000.3.16f1, 6000.5.4f1, 6000.6.0b1, 6000.7.0a2
Not reproducible with: 6000.0.21f1, 6000.0.78f1, 6000.3.0a4

Testing environment: macOS 26.5.1

Reproducible with these devices:
VLNQA00521 - Galaxy S22 Ultra USA (SM-S908U), CPU: Snapdragon 8 Gen 1 (SM8450), GPU: Adreno 730, OS: 14

Not reproducible with these devices:
VLNQA00422 - Galaxy S21 Ultra 5G (SM-G998B), CPU: Exynos 2100, GPU: Mali-G78, OS: 11

First lines of the backtrace:
{{#00 pc 0000000002a2dfe0 (Curl_splaygetbest at splay.c:0) /data/app/~~JNsafRRZvpikhT46ku-qaw==/com.curlcrash.repro-u2spN1A7lU_dV4SMyOi1ug==/lib/arm64/libunity.so (Curl_splaygetbest+88) (BuildId: 02ebb8136c66563d0941d47c0f018a2a0eac14f2) }}
{{#01 pc 0000000002a1ef90 (curl_multi_perform at multi.c:0) /data/app/~~JNsafRRZvpikhT46ku-qaw==/com.curlcrash.repro-u2spN1A7lU_dV4SMyOi1ug==/lib/arm64/libunity.so (curl_multi_perform+216) (BuildId: 02ebb8136c66563d0941d47c0f018a2a0eac14f2) }}
#02 pc 0000000001845ef8 (CurlExecutor::CurlExecute() at /home/bokken/build/output/unity/unity/./Modules/UnityWebRequest/Implementations/TransportCurl.cpp:146) /data/app/~~JNsafRRZvpikhT46ku-qaw==/com.curlcrash.repro-u2spN1A7lU_dV4SMyOi1ug==/lib/arm64/libunity.so (CurlExecutor::CurlExecute()+44) (BuildId: 02ebb8136c66563d0941d47c0f018a2a0eac14f2)