diff --git a/.github/workflows/netbsd.yml b/.github/workflows/netbsd.yml
index f14b617..a468035 100644
--- a/.github/workflows/netbsd.yml
+++ b/.github/workflows/netbsd.yml
@@ -24,9 +24,6 @@ env:
   CCACHE_MAXSIZE: 500M
   # See https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories
   CI_NCPU: 4
-  # TODO: Fix the excluded test and re-enable it.
-  # See: https://github.com/bitcoin/bitcoin/issues/33128.
-  FUNCTIONAL_TESTS_EXCLUDE: '--exclude feature_reindex_init.py'
 
 jobs:
   netbsd-syslibs:
@@ -40,7 +37,8 @@ jobs:
       - name: Checkout Bitcoin Core repo
         uses: actions/checkout@v4
         with:
-          repository: bitcoin/bitcoin
+          repository: hebasto/bitcoin
+          ref: 250809-fallback-fallocate
 
       - name: Start NetBSD VM
         uses: vmactions/netbsd-vm@v1
@@ -89,7 +87,7 @@ jobs:
         if: ${{ ! inputs.skip_functional_tests }}
         run: |
           cd ${{ github.workspace }}
-          python3.13 build/test/functional/test_runner.py --ci --extended -j ${{ env.CI_NCPU }} --combinedlogslen=99999999 --quiet --tmpdirprefix . --timeout-factor=8 ${{ env.FUNCTIONAL_TESTS_EXCLUDE }}
+          python3.13 build/test/functional/test_runner.py --ci --extended -j ${{ env.CI_NCPU }} --combinedlogslen=99999999 --quiet --tmpdirprefix . --timeout-factor=8
 
   netbsd-depends:
     name: 'NetBSD: depends, MP'
@@ -102,7 +100,8 @@ jobs:
       - name: Checkout Bitcoin Core repo
         uses: actions/checkout@v4
         with:
-          repository: bitcoin/bitcoin
+          repository: hebasto/bitcoin
+          ref: 250809-fallback-fallocate
 
       - name: Start NetBSD VM
         uses: vmactions/netbsd-vm@v1
@@ -161,4 +160,4 @@ jobs:
         if: ${{ ! inputs.skip_functional_tests }}
         run: |
           cd ${{ github.workspace }}
-          python3.13 build/test/functional/test_runner.py --ci --extended -j ${{ env.CI_NCPU }} --combinedlogslen=99999999 --quiet --tmpdirprefix . --timeout-factor=8 ${{ env.FUNCTIONAL_TESTS_EXCLUDE }}
+          python3.13 build/test/functional/test_runner.py --ci --extended -j ${{ env.CI_NCPU }} --combinedlogslen=99999999 --quiet --tmpdirprefix . --timeout-factor=8
diff --git a/.github/workflows/omnios.yml b/.github/workflows/omnios.yml
index fae8d55..38cd7c6 100644
--- a/.github/workflows/omnios.yml
+++ b/.github/workflows/omnios.yml
@@ -25,9 +25,6 @@ env:
   CCACHE_COMPRESS: 1
   # See https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories
   CI_NCPU: 4
-  # TODO: Fix the excluded test and re-enable it.
-  # See: https://github.com/bitcoin/bitcoin/issues/33128.
-  FUNCTIONAL_TESTS_EXCLUDE: '--exclude feature_reindex_init.py'
 
 jobs:
   omnios:
@@ -41,7 +38,8 @@ jobs:
       - name: Checkout Bitcoin Core repo
         uses: actions/checkout@v4
         with:
-          repository: bitcoin/bitcoin
+          repository: hebasto/bitcoin
+          ref: 250809-fallback-fallocate
 
       - name: Start OmniOS VM
         uses: vmactions/omnios-vm@v1
@@ -112,4 +110,4 @@ jobs:
         run: |
           cd ${{ github.workspace }}
           export LD_LIBRARY_PATH="/opt/gcc-14/lib/amd64:/usr/gnu/lib/amd64"
-          ./build/test/functional/test_runner.py --ci --extended -j ${{ env.CI_NCPU }} --combinedlogslen=99999999 --quiet --tmpdirprefix . --timeout-factor=8 ${{ env.FUNCTIONAL_TESTS_EXCLUDE }}
+          ./build/test/functional/test_runner.py --ci --extended -j ${{ env.CI_NCPU }} --combinedlogslen=99999999 --quiet --tmpdirprefix . --timeout-factor=8
diff --git a/.github/workflows/openbsd.yml b/.github/workflows/openbsd.yml
index 1ba784f..5e3a9b7 100644
--- a/.github/workflows/openbsd.yml
+++ b/.github/workflows/openbsd.yml
@@ -24,9 +24,6 @@ env:
   CCACHE_MAXSIZE: 300M
   # See https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories
   CI_NCPU: 4
-  # TODO: Fix the excluded test and re-enable it.
-  # See: https://github.com/bitcoin/bitcoin/issues/33128.
-  FUNCTIONAL_TESTS_EXCLUDE: '--exclude feature_reindex_init.py'
 
 jobs:
   openbsd-syslibs:
@@ -40,7 +37,8 @@ jobs:
       - name: Checkout Bitcoin Core repo
         uses: actions/checkout@v4
         with:
-          repository: bitcoin/bitcoin
+          repository: hebasto/bitcoin
+          ref: 250809-fallback-fallocate
 
       - name: Start OpenBSD VM
         uses: vmactions/openbsd-vm@v1
@@ -85,7 +83,7 @@ jobs:
         if: ${{ ! inputs.skip_functional_tests }}
         run: |
           cd ${{ github.workspace }}
-          ./build/test/functional/test_runner.py --ci --extended -j ${{ env.CI_NCPU }} --combinedlogslen=99999999 --quiet --tmpdirprefix . --timeout-factor=8 ${{ env.FUNCTIONAL_TESTS_EXCLUDE }}
+          ./build/test/functional/test_runner.py --ci --extended -j ${{ env.CI_NCPU }} --combinedlogslen=99999999 --quiet --tmpdirprefix . --timeout-factor=8
 
   openbsd-depends:
     name: 'OpenBSD: depends, MP'
@@ -98,7 +96,8 @@ jobs:
       - name: Checkout Bitcoin Core repo
         uses: actions/checkout@v4
         with:
-          repository: bitcoin/bitcoin
+          repository: hebasto/bitcoin
+          ref: 250809-fallback-fallocate
 
       - name: Start OpenBSD VM
         uses: vmactions/openbsd-vm@v1
@@ -153,4 +152,4 @@ jobs:
         if: ${{ ! inputs.skip_functional_tests }}
         run: |
           cd ${{ github.workspace }}
-          ./build/test/functional/test_runner.py --ci --extended -j ${{ env.CI_NCPU }} --combinedlogslen=99999999 --quiet --tmpdirprefix . --timeout-factor=8 ${{ env.FUNCTIONAL_TESTS_EXCLUDE }}
+          ./build/test/functional/test_runner.py --ci --extended -j ${{ env.CI_NCPU }} --combinedlogslen=99999999 --quiet --tmpdirprefix . --timeout-factor=8