expression_parsing: parse member type instead of leaving as raw str

slither/solc_parsing/expressions/expression_parsing.py

@@ -674,11 +674,11 @@ def parse_expression(expression: Dict, caller_context: CallerContext) -> "Expres
     if name == "MemberAccess":
         if caller_context.is_compact_ast:
             member_name = expression["memberName"]
-            member_type = expression["typeDescriptions"]["typeString"]
+            member_type = parse_type(UnknownType(expression["typeDescriptions"]["typeString"]), caller_context)
             member_expression = parse_expression(expression["expression"], caller_context)
         else:
             member_name = expression["attributes"]["member_name"]
-            member_type = expression["attributes"]["type"]
+            member_type = parse_type(UnknownType(expression["attributes"]["type"]), caller_context)
             children = expression["children"]
             assert len(children) == 1
             member_expression = parse_expression(children[0], caller_context)