Error: SSL intermediate chain is not valid

Hello. When adding a certificate from Sectigo I get an error - Error: SSL intermediate chain is not valid

How to solve the problem?

Insert the full chain, including the intermediate should solve the issue.

I do that. But I get an error.

Do you want to add it to a webdomain or as hestia panel certificate?

I add via web interface. This is a regular domain (site). Not a certificate for the panel

The panel is: v1.9.0~beta1

Bought a new certificate. When adding a certificate, now there is no error, it just does not install. The certificate checkboxes are reset and nothing works.