ORA-00900 on embedded single quotes in /* */ comments, sometimes

Connecting to any 19c database (19.17 and later) using version (4.122.19.1:20021007) of the Oracle.ManagedDataAccess.dll with C# returns ORA-00900 when comments enclosed by /* */ contains single quotes. Sometimes.

The code blocks sent are in C# code that look like this:

using System;

using Oracle.ManagedDataAccess.Client;

namespace OracleSingleQuotes

{

      class Program

      {

             static void Main(string[] args)

             {

                     int rows = 0;

. . .

               OracleCommand cmd = new OracleCommand();

                            cmd.Connection = conn;

                            cmd.CommandText = @"

                                   /*Bob's test*/

                                   select count(*)

                                   /*Bob's test*/

                                   from DUAL";

. . .

This generates an ORA-00900. If the single quote is not in the first line, it works fine. Single quotes in two comment lines at the beginning and in the 4th line