Apache errors (WordPress 6.3.1)

WordPress 6.3.1. PHP 8+. When I create a new post or modify an old one, an error is recorded in the server logs.

My hosting provider said it was due to plugins. I don’t have any other plugins except Polylang that are related to posts. I also don’t use page builders.

Error texts:

Error receiving response header (lsphp is killed?): ReceiveResponseHeader: receive pkg hdr failed: ReceivePkgHdr: nothing to read from backend (LVE ID 1248), check https://docs.cloudlinux.com/mod_lsapi_troubleshooting.html

Error on sending request(GET /wp-json/wp/v2/blocks?context=edit&per_page=100&lang=uk&_locale=user HTTP/1.0); uri(/index.php?context=edit&per_page=100&lang=uk&_locale=user) content-length(0): ReceiveAckHdr: nothing to read from backend (LVE ID 1248)

Error on sending request(GET /wp-json/wp/v2/block-patterns/patterns?lang=uk&_locale=user HTTP/1.0); uri(/index.php?lang=uk&_locale=user) content-length(0): ReceiveAckHdr: nothing to read from backend (LVE ID 1248)

Error on sending request(OPTIONS /wp-json/wp/v2/templates?lang=uk&_locale=user HTTP/1.0); uri(/index.php?lang=uk&_locale=user) content-length((null)): ReceiveAckHdr: nothing to read from backend (LVE ID 1248)

Error on sending request(OPTIONS /wp-json/wp/v2/media?lang=uk&_locale=user HTTP/1.0); uri(/index.php?lang=uk&_locale=user) content-length((null)): ReceiveAckHdr: nothing to read from backend (LVE ID 1248)

Error on sending request(OPTIONS /wp-json/wp/v2/settings?lang=uk&_locale=user HTTP/1.0); uri(/index.php?lang=uk&_locale=user) content-length((null)): ReceiveAckHdr: nothing to read from backend (LVE ID 1248)