MMH5.5 - Heroes of Might and Magic 5.5

First part of your message: Do you mean that the Town Management spell was not available in the hero's spellbook and randomly appeared at some point in the game?
Second part: Town conversion was executed, but no conversion happened. Did resources get subtracted from the player?

Checking with the team...

The Town Manager scroll is available, as is the menu for selecting town upgrades. However, after activating it, the management menu closes (previously, it would switch to displaying a list of the resources needed for the upgrade), and this message appears: "You have gained the ability to upgrade towns" (see the image below), but nothing new appears in the spellbook. The player's resources and the hero's movement points do not change, and the town is not upgraded. The game does not display any messages regarding limitations on the number of faction towns (previously, when the maximum number of towns was reached, the game would notify the player).