ParagonIE_Sodium_Core32_Curve25519 not found

Since updating to WordPress 5.9.2, I’ve been getting the following PHP fatal error several times a day. I’ve never had this error before. I haven’t made any changes to anything on the server since updating to WordPress 5.9.2 (a few weeks ago?). It’s not a plugin issue, I don’t use any plugins.

PHP Fatal error:  Uncaught Error: Class "ParagonIE_Sodium_Core32_Curve25519" not found in home/{MY}/public_html/wp-includes/sodium_compat/src/Core32/Ed25519.php:10
Stack trace:
#0 {main}
  thrown in home/{MY}/public_html/wp-includes/sodium_compat/src/Core32/Ed25519.php on line 10