RTVE, the public television, has been controlled for months by Podemos, so it is neither new nor strange that they hide the Head of State, if it is not to talk about his father's controversies.
The Casa Real YouTube channel normally has videos from the EFE Agency, which is also controlled by the government. Since the arrival of PSOE and Podemos, the videos have taken a long time to appear. Also the web server is controlled by the government.
The Spanish government is mismanaging the crisis, and the attitude of some media is more to protect the government than to report transparently. Some private media received financial aid at the start of the crisis, and will probably need more public aid ... so they must protect their money.
Spain is in a state of alarm, the government has special powers, and the King's room for maneuver is more limited. And a government with a lot of ego and that increasingly has a worse image, does not want the Head of State to overshadow them.