In ReentrancyGuard.sol, _status is initially set in the constructor. Because the _status variable is private, it cannot be set by other contracts inheriting the ReentrancyGuard. As such, a proxy pointing to a mastercopy that inherits ReentrancyGuard is unable to initialize _status, which means all functions which include the nonReentrant modifier will fail with "ReentrancyGuard: reentrant call".
How would you recommend for proxies to work with ReentrancyGuard?