Well, this is embarrassing: I somehow missed that MagerValp released an incremental update for Ultima 4 Remastered back in May:

I apparently managed to screw up the end game graphics while preparing the 2.2 release, which Trurl brought to my attention. Sorry folks!

What’s New in v2.2.1

• Fixed graphics corruption and potential crash during ending.

For older changes see the full changelog.

Anyhow, you can download the updated version of this strikingly gorgeous reworking of Ultima 4 for the Commodore platform from its CSDb entry, or via the project entry here.