[SOLVED] unable to assign free hole to a shell error when flattening polygons

I have a list of polygons and I want to group them by the road_name property and flatten the polygons.
I tried the following:
{"type": "FeatureCollection", "features": [{"type": "Feature", "properties": {"compositeid": "06000_2.5_2.78_5_B3_F0_PT3_T4", "index": 520, "road_name": "Gorge Rd"}, "geometry": {"type": "MultiPolygon", "coordinates": [[[[138.6288, -34.8485], [138.6268, -34.8502], [138.6267, -34.8503], [138.6267, -34.8504], [138.6261, -34.8521], [138.6263, -34.8525], [138.6264, -34.8539], [138.6266, -34.8541], [138.6268, -34.8547], [138.6271, -34.8555], [138.6272, -34.8557], [138.6268, -34.8564], [138.6261, -34.8575], [138.6259, -34.8582], [138.6264, -34.8593], [138.6259, -34.8601], [138.6268, -34.8596], [138.6275, -34.8605], [138.6287, -34.8611], [138.6274, -34.8624], [138.629, -34.8613], [138.63, -34.8621], [138.6312, -34.8627], [138.6313, -34.8628], [138.6318, -34.8629], [138.6332, -34.8631], [138.6334, -34.8632], [138.6354, -34.863], [138.6356, -34.8632], [138.6371, -34.8629], [138.6378, -34.8624], [138.6382, -34.8625], [138.64, -34.8614], [138.6419, -34.8613], [138.6422, -34.8614], [138.6435, 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[138.71, -34.8125], [138.7095, -34.813], [138.7083, -34.8143], [138.7081, -34.816]]], [[[138.5954, -34.9228], [138.5961, -34.9226], [138.5978, -34.9222], [138.5983, -34.9218], [138.5995, -34.9204], [138.5989, -34.92], [138.5983, -34.9192], [138.5978, -34.9204], [138.5961, -34.9218], [138.5954, -34.9222], [138.5954, -34.9228]]], [[[138.6465, -34.8305], [138.6466, -34.8305], [138.6466, -34.8305], [138.6466, -34.8305], [138.6466, -34.8304], [138.6465, -34.8305], [138.6465, -34.8305]]], [[[138.7057, -34.7999], [138.7058, -34.8001], [138.7058, -34.7999], [138.7058, -34.7999], [138.7058, -34.7999], [138.7057, -34.7999], [138.7057, -34.7999]]], [[[138.7182, -34.8167], [138.7189, -34.8177], [138.7193, -34.8161], [138.7203, -34.815], [138.7189, -34.8156], [138.7178, -34.8161], [138.7182, -34.8167]]], [[[138.6023, -34.91], [138.6027, -34.9098], [138.6028, -34.9096], [138.6035, -34.909], [138.6027, -34.9096], [138.6025, -34.9096], [138.6023, -34.91]]]]}}]}

import geopandas as gpd

gdf = gpd.GeoDataFrame.from_features(polygons_list['features'])
gdf.geometry.unary_union
This gives me the following error: TopologyException: unable to assign free hole to a shell at 138.63339999999999 -34.869500000000002
Any ideas in how I can fix this or workaround?