diff --git a/lib/galaxy/tool_util/parameters/factory.py b/lib/galaxy/tool_util/parameters/factory.py
index e2d5e42d514..e672f3cb28d 100644
--- a/lib/galaxy/tool_util/parameters/factory.py
+++ b/lib/galaxy/tool_util/parameters/factory.py
@@ -232,6 +232,7 @@ def _from_input_source_galaxy(input_source: InputSource, profile: float) -> Tool
                 optional=optional,
                 multiple=multiple,
                 url_default=url_default,
+                extensions=input_source.parse_extensions(),
                 **_common_param_kwargs(input_source),
             )
         elif param_type == "data_collection":
@@ -243,6 +244,7 @@ def _from_input_source_galaxy(input_source: InputSource, profile: float) -> Tool
                 name=input_source.parse_name(),
                 optional=optional,
                 value=default_value,
+                extensions=input_source.parse_extensions(),
                 **_common_param_kwargs(input_source),
             )
         elif param_type == "select":
diff --git a/test/unit/tool_util/test_parameter_convert.py b/test/unit/tool_util/test_parameter_convert.py
index 12028001475..bee772863f6 100644
--- a/test/unit/tool_util/test_parameter_convert.py
+++ b/test/unit/tool_util/test_parameter_convert.py
@@ -23,11 +23,14 @@ from galaxy.tool_util.parameters import (
     RequestToolState,
     strictify,
 )
+from galaxy.tool_util.parser.factory import get_tool_source
 from galaxy.tool_util.parser.util import parse_profile_version
+from galaxy.tool_util.unittest_utils import functional_test_tool_path
 from galaxy.tool_util_models.parameters import (
     BooleanParameterModel,
     ConditionalParameterModel,
     ConditionalWhen,
+    DataCollectionParameterModel,
     DataParameterModel,
     SectionParameterModel,
     ToolParameterBundleModel,
@@ -45,6 +48,19 @@ ID_MAP: Dict[int, str] = {
 }
 
 
+def test_data_parameter_models_carry_extensions():
+    tool_source = get_tool_source(functional_test_tool_path("implicit_conversion_shared_input_y.yml"))
+    bundle = input_models_for_tool_source(tool_source)
+    assert [p.extensions for p in bundle.parameters if isinstance(p, DataParameterModel)] == [["fasta"], ["tabular"]]
+
+
+def test_data_collection_parameter_models_carry_extensions():
+    bundle = input_models_for_tool_source(tool_source_for("implicit_collection_conversion"))
+    (parameter,) = bundle.parameters
+    assert isinstance(parameter, DataCollectionParameterModel)
+    assert parameter.extensions == ["tabular"]
+
+
 def test_decode_data():
     tool_source = tool_source_for("parameters/gx_data")
     bundle = input_models_for_tool_source(tool_source)