Maybe your AUR helper cache is out of date? Clean build works fine:

% git clone https://aur.archlinux.org/trufflehog-bin.git && cd trufflehog-bin && makepkg -sr  
Cloning into 'trufflehog-bin'...
...
==> Finished making: trufflehog-bin 3.90.6-1

Seems the checksum doesn't match for generic_with_filters.yml.

diff --git a/.SRCINFO b/.SRCINFO
index 14fcf51..3ca0191 100644
--- a/.SRCINFO
+++ b/.SRCINFO
@@ -11,7 +11,7 @@ pkgbase = trufflehog-bin
        source = https://raw.githubusercontent.com/trufflesecurity/trufflehog/v3.90.6/examples/generic.yml
        source = https://raw.githubusercontent.com/trufflesecurity/trufflehog/v3.90.6/examples/generic_with_filters.yml
        sha256sums = 37e56a67543eea634967c9516831c823967fb2e2cbfedc036be25648f5d696d2
-       sha256sums = b1dc9104998919f161e89aa8512699ed20b50c601cfbcebc4ba630e69cf3e62e
+       sha256sums = f01a5a32d359e07a30b56df2b8c5b303e398d9801c1c4e775c09912b42ca74e7
        source_x86_64 = https://github.com/trufflesecurity/trufflehog/releases/download/v3.90.6/trufflehog_3.90.6_linux_amd64.tar.gz
        sha256sums_x86_64 = edbca2465f76a7a4aa2f87ed02559975e366b7e9142a5dee035f65fd51a970ae
        source_aarch64 = https://github.com/trufflesecurity/trufflehog/releases/download/v3.90.6/trufflehog_3.90.6_linux_arm64.tar.gz
diff --git a/PKGBUILD b/PKGBUILD
index e4a0047..9ea143d 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -19,7 +19,7 @@ source_x86_64=("$url/releases/download/v$pkgver/trufflehog_${pkgver}_linux_amd64
 source_aarch64=("$url/releases/download/v$pkgver/trufflehog_${pkgver}_linux_arm64.tar.gz")

 sha256sums=('37e56a67543eea634967c9516831c823967fb2e2cbfedc036be25648f5d696d2'
-            'b1dc9104998919f161e89aa8512699ed20b50c601cfbcebc4ba630e69cf3e62e')
+            'f01a5a32d359e07a30b56df2b8c5b303e398d9801c1c4e775c09912b42ca74e7')
 sha256sums_x86_64=('edbca2465f76a7a4aa2f87ed02559975e366b7e9142a5dee035f65fd51a970ae')
 sha256sums_aarch64=('badf4d2ad147a91c99adcde5c40e69fc3808496d72aa9b1f8265824862488277')