syntax error: missing argument after '>' in parallel runs on windows

[llxia]

https://ci.adoptium.net/job/Test_openjdk11_hs_extended.openjdk_x86-64_windows_testList_0/43/console

01:40:08.591  Running testList ...
01:40:08.923  There are 1 test targets in testList
01:40:08.923  "c:/jenkins/workspace/Test_openjdk11_hs_extended.openjdk_x86-64_windows_testList_0/jdkbinary/j2sdk-image\\bin\\java" -version
01:40:08.923  openjdk version "11.0.29" 2025-10-21
01:40:08.923  OpenJDK Runtime Environment Temurin-11.0.29+7 (build 11.0.29+7)
01:40:08.923  OpenJDK 64-Bit Server VM Temurin-11.0.29+7 (build 11.0.29+7, mixed mode)
01:40:09.256  make[3]: Entering directory '/cygdrive/c/jenkins/workspace/Test_openjdk11_hs_extended.openjdk_x86-64_windows_testList_0/aqa-tests'
01:40:09.256  make[4]: Entering directory '/cygdrive/c/jenkins/workspace/Test_openjdk11_hs_extended.openjdk_x86-64_windows_testList_0/aqa-tests/openjdk'
01:40:12.889  expr: non-integer argument
01:40:12.889  expr: syntax error: missing argument after '>'

This issue does not seem to occur on other platforms:
https://ci.adoptium.net/job/Test_openjdk11_hs_extended.openjdk_aarch64_linux_testList_0/55/console

01:23:16.100  Running testList ...
01:23:16.100  There are 3 test targets in testList
01:23:16.100  "/home/jenkins/workspace/Test_openjdk11_hs_extended.openjdk_aarch64_linux_testList_0/jdkbinary/j2sdk-image/bin/java" -version
01:23:16.101  openjdk version "11.0.29" 2025-10-21
01:23:16.101  OpenJDK Runtime Environment Temurin-11.0.29+6 (build 11.0.29+6)
01:23:16.101  OpenJDK 64-Bit Server VM Temurin-11.0.29+6 (build 11.0.29+6, mixed mode)
01:23:16.101  make[3]: Entering directory '/home/jenkins/workspace/Test_openjdk11_hs_extended.openjdk_aarch64_linux_testList_0/aqa-tests'
01:23:16.101  make[4]: Entering directory '/home/jenkins/workspace/Test_openjdk11_hs_extended.openjdk_aarch64_linux_testList_0/aqa-tests/openjdk'
01:23:16.101