How do I make Android 11 stop removing a Wi-Fi certificate?

I'm using a Google Pixel 3a. A week ago, it was connecting all well to the corporate Wi-Fi which uses WPA Enterprise, but recently, it stopped. In order to connect, I do the following: 1. Download the ca.pem file containing the CA certificate and the .p12 file containing the device certificate. 1. Install both CA and device certificates through *Security* › *Encryption & credentials* › *Install a certificate* › *Wi-Fi certificate*. 1. Configure the Wi-Fi to use those certificates. 1. EAP method being set to TLS, just as before. As soon as I try to connect, it fails with no error message or details, **and the CA certificate gets removed** from the *User credentials* list (the ca.pem file is preserved). The behavior is the same no matter what I set in *Online certificate status* field (including “Do not validate” value that I can still use). Why would Android remove the CA certificate? What do I need to do to make it stop doing that, and use the certificate to actually open the Wi-Fi connection?