hello.
Even in my environment, there are projects that can read maps and projects that cannot. The difference is that when you open the task manager while the unreadable project is open, the task "ExcelToSQLite.exe" is always running.
Therefore, when I renamed the application "ExcelToSQLite.exe" in "C:\Program Files\ArcGIS\Pro\bin" to "-ExcelToSQLite.exe" and opened the project, I was able to open the map became.
However, in this state, Excel files cannot be handled.(´・ω・`)