Let's Encrypts new ECDSA intermediates (Ex) have a direct signature to both ISRG Root X1 and ISRG Root X2. This removes any need for a cross sign from ISRG Root X2 to X1, as the intermediates have a direct link already. This was deployed in 2024: Deploying Let's Encrypt's New Issuance Chains
Since then, the cross-sign has not been included in any chains offered by Let's Encrypt. It should no longer be used by a server. Your server should always use the chains offered by Let's Encrypt. It is unlikely that Let's Encrypt will renew the cross-signed X2, as it is obsolete.
Not all operating systems trust ISRG Root X2. See the certificate compatibility page: Certificate Compatibility - Let's Encrypt. Depending on your use case, you may be able to accept this compatiblity. Note that by default, Let's Encrypt issues an ECDSA chain that terminates at ISRG Root X1 and does not use X2 at all. You can opt into the X2 chain if you can accept the reduced compatibility.