Only first certificate is being installed from CA SSL bundle on attempt to install CA certificate for website with NG hosting
CCPv1/CCPv2 > Websites > required site > Webhosting settings/Configure Hosting Settings > SSL tab > Install new CA certificate > Install new CA certificate > Choose File/Clipboard > Provide a file with chain of SSL certificates
As a result only the first certificate from the chain is uploaded in webspace location.
It can be checked in the file
/var/www/vhosts/01/<webspaceID>/webspace/certs/httpsd.pemca on the NG Web Server.
This behavior has been reported to Odin Development team as request #POA-115035: POA can't operate with chain of SSL certificates.
Contact your Technical Account Manager or Pooled Technical Associate Team (firstname.lastname@example.org) in order to trace the current status of #POA-115035 and to apply a workaround.