diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b80185714617..df3b4cbebf3d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -65,9 +65,9 @@ jobs:
         if [[ ${{ matrix.db-type }} == 'pgsql' ]]; then export DB_DSN='postgres://postgres@127.0.0.1:${{ job.services.postgres.ports['5432'] }}/postgres'; fi
 
         if [[ ${{ matrix.php-version }} == '7.2' ]]; then
-          vendor/bin/phpunit
+          vendor/bin/phpunit --testsuite=database
         else
-          vendor/bin/phpunit --verbose
+          vendor/bin/phpunit --verbose --testsuite=database
         fi
 
   coding-standard:
diff --git a/src/Database/TypeFactory.php b/src/Database/TypeFactory.php
index 95eb8c6d87b4..f45b03053de9 100644
--- a/src/Database/TypeFactory.php
+++ b/src/Database/TypeFactory.php
@@ -77,6 +77,10 @@ public static function build(string $name): TypeInterface
             throw new InvalidArgumentException(sprintf('Unknown type "%s"', $name));
         }
 
+        if ($name === 'decimal' && static::$_types[$name] !== Type\DecimalType::class) {
+            throw new \RuntimeException('Not set to DecimalType');
+        }
+
         /** @var \Cake\Database\TypeInterface */
         return static::$_builtTypes[$name] = new static::$_types[$name]($name);
     }
diff --git a/src/ORM/Marshaller.php b/src/ORM/Marshaller.php
index 22c8e3763d62..fa34919699db 100644
--- a/src/ORM/Marshaller.php
+++ b/src/ORM/Marshaller.php
@@ -169,6 +169,8 @@ protected function _buildPropertyMap(array $data, array $options): array
     public function one(array $data, array $options = []): EntityInterface
     {
         [$data, $options] = $this->_prepareDataAndOptions($data, $options);
+        //echo 'Marshaller::one' . PHP_EOL;
+        //print_r($data);
 
         $primaryKey = (array)$this->_table->getPrimaryKey();
         $entityClass = $this->_table->getEntityClass();
@@ -182,6 +184,8 @@ public function one(array $data, array $options = []): EntityInterface
             }
         }
         $errors = $this->_validate($data, $options, true);
+        //echo 'Marshaller::one - _validate' . PHP_EOL;
+        //print_r($data);
 
         $options['isMerge'] = false;
         $propertyMap = $this->_buildPropertyMap($data, $options);
@@ -205,6 +209,8 @@ public function one(array $data, array $options = []): EntityInterface
             }
         }
 
+        //echo 'Marshaller::one - properties' . PHP_EOL;
+        //print_r($properties);
         if (isset($options['fields'])) {
             foreach ((array)$options['fields'] as $field) {
                 if (array_key_exists($field, $properties)) {
@@ -215,6 +221,9 @@ public function one(array $data, array $options = []): EntityInterface
             $entity->set($properties);
         }
 
+        //echo 'Marshaller::one - set' . PHP_EOL;
+        //print_r($entity);
+
         // Don't flag clean association entities as
         // dirty so we don't persist empty records.
         foreach ($properties as $field => $value) {
diff --git a/tests/Fixture/DatatypesFixture.php b/tests/Fixture/DatatypesFixture.php
index aa15ab9018c2..bee22a1dbcd3 100644
--- a/tests/Fixture/DatatypesFixture.php
+++ b/tests/Fixture/DatatypesFixture.php
@@ -27,7 +27,7 @@ class DatatypesFixture extends TestFixture
     public $fields = [
         'id' => ['type' => 'biginteger'],
         'cost' => ['type' => 'decimal', 'length' => 20, 'precision' => 1, 'null' => true],
-        'fraction' => ['type' => 'decimal', 'length' => 15, 'precision' => 14, 'null' => true],
+        'fraction' => ['type' => 'decimal', 'length' => 20, 'precision' => 19, 'null' => true],
         'floaty' => ['type' => 'float', 'null' => true],
         'small' => ['type' => 'smallinteger', 'null' => true],
         'tiny' => ['type' => 'tinyinteger', 'null' => true],
diff --git a/tests/TestCase/ORM/QueryTest.php b/tests/TestCase/ORM/QueryTest.php
index 01ba4eb32cea..dd34da31630a 100644
--- a/tests/TestCase/ORM/QueryTest.php
+++ b/tests/TestCase/ORM/QueryTest.php
@@ -28,6 +28,7 @@
 use Cake\Event\EventInterface;
 use Cake\I18n\FrozenTime;
 use Cake\I18n\Time;
+use Cake\Log\Log;
 use Cake\ORM\Query;
 use Cake\ORM\ResultSet;
 use Cake\TestSuite\TestCase;
@@ -3182,12 +3183,15 @@ public function testSelectLargeNumbers()
 
         $big = '1234567890123456789.2';
         $table = $this->getTableLocator()->get('Datatypes');
+        print_r($table->getSchema());
+
         $entity = $table->newEntity([]);
         $entity->cost = $big;
         $entity->tiny = 1;
         $entity->small = 10;
 
         $table->saveOrFail($entity);
+
         $out = $table->find()
             ->where([
                 'cost' => $big,
@@ -3196,19 +3200,34 @@ public function testSelectLargeNumbers()
         $this->assertNotEmpty($out, 'Should get a record');
         $this->assertSame($big, $out->cost);
 
-        $small = '0.12345678901234';
+        $small = '0.123456789012345';
+        echo $small . ' - ' . gettype($small) . PHP_EOL;
         $entity = $table->newEntity(['fraction' => $small]);
-
+        print_r($entity);
+        $extracted = $entity->extract(['fraction']);
+        print_r($extracted);
+        echo 'fraction - ' . gettype($extracted['fraction']) . PHP_EOL;
+
+        Log::setConfig('queryLog', [
+            'className' => 'Array',
+            'scopes' => ['queriesLog'],
+        ]);
+        $this->connection->enableQueryLogging();
         $table->saveOrFail($entity);
+        $this->connection->disableQueryLogging();
+        print_r(Log::engine('queryLog')->read());
+        Log::drop('queryLog');
+
+        print_r($table->find()->all()->toList());
         $out = $table->find()
             ->where([
                 'fraction' => $small,
             ])
             ->first();
         $this->assertNotEmpty($out, 'Should get a record');
-        $this->assertRegExp('/^0?\.12345678901234/', $out->fraction);
+        $this->assertRegExp('/^0?\.123456789012345/', $out->fraction);
 
-        $small = 0.12345678901234;
+        $small = 0.123456789012345;
         $entity = $table->newEntity(['fraction' => $small]);
 
         $table->saveOrFail($entity);