diff --git a/src/tests/regression.test.ts b/src/tests/regression.test.ts
new file mode 100644
index 00000000..3d245416
--- /dev/null
+++ b/src/tests/regression.test.ts
@@ -0,0 +1,44 @@
+import { assert } from '@std/assert'
+import { pathsToTree } from '../files/filetree.ts'
+import { validate } from '../validators/bids.ts'
+import type { BIDSFile } from '../types/filetree.ts'
+
+
+Deno.test('Regression tests', async (t) => {
+  await t.step('Verify ignored files in scans.tsv do not trigger error', async () => {
+    const paths = [
+      '/dataset_description.json',
+      '/sub-01/anat/sub-01_T1w.nii.gz',
+      '/sub-01/anat/sub-01_CT.nii.gz',  // unknown file
+      '/sub-01/sub-01_scans.tsv',
+    ]
+    const ignore = ['*_CT.nii.gz']
+    const scans_content = 'filename\nanat/sub-01_T1w.nii.gz\nanat/sub-01_CT.nii.gz\n'
+
+    // Without ignore, NOT_INCLUDED is triggered for CT, but the scans file is happy
+    let ds = pathsToTree(paths)
+    let scans_tsv = ds.get('sub-01/sub-01_scans.tsv') as BIDSFile
+    scans_tsv.text = () => Promise.resolve(scans_content)
+    let result = await validate(ds, {
+      datasetPath: '/dataset',
+      debug: 'ERROR',
+      ignoreNiftiHeaders: true,
+      blacklistModalities: [],
+    })
+    assert(result.issues.get({ code: 'NOT_INCLUDED' }).length == 1)
+    assert(result.issues.get({ code: 'SCANS_FILENAME_NOT_MATCH_DATASET' }).length == 0)
+
+    // With ignore, NOT_INCLUDED is not triggered for CT, and the scans file is still happy
+    ds = pathsToTree(paths, ignore)
+    scans_tsv = ds.get('sub-01/sub-01_scans.tsv') as BIDSFile
+    scans_tsv.text = () => Promise.resolve(scans_content)
+    result = await validate(ds, {
+      datasetPath: '/dataset',
+      debug: 'ERROR',
+      ignoreNiftiHeaders: true,
+      blacklistModalities: [],
+    })
+    assert(result.issues.get({ code: 'NOT_INCLUDED' }).length == 0)
+    assert(result.issues.get({ code: 'SCANS_FILENAME_NOT_MATCH_DATASET' }).length == 0)
+  })
+})