Icons are upgraded from classic raster icons to SVG/symbols.

As a side effect, since these do not support title attributes, the titles are gone from such icons.

This is a problem when titles include important information, like the migration "buttons" used in matrix-auth.

For the particular matrix-auth icon, 2.340 is the release introducing the problem, but I assume it depends on the icon which Jenkins release migrates it to a different implementation.