Yes, the prestets that come with instrument are not so good, but I would not say this is a bug.
There are a lot of bugs like random symbols displayed, not all buttons working in all menus, some settings can't be saved sometimes (but sometimes can), not all features available are described or working as they should. See some here:
What's interesting, there's an updated version of MZ-X500, for Latin America market, with refreshed look and never firmware (1.61), which has SOME of these bugs fixed, but that firmware is not available for download.
Btw, CT-X series are still made- mine was CT-X5000 C2, and recently I went to a shop and now they have C7 modification.
And for the COVID, I don't see any Yamaha releases cancelled or being late, due to that