A runtime warning.
Separate font atlases are created for each font and font size. This is expensive, and the memory is never reclaimed when e.g. interpolating TextFont::font_size or UiScale::scale.
If you need to smoothly scale font size, use Transform::scale.
You can disable this warning by setting TextSettings::allow_dynamic_font_size to true or raise the limit by setting TextSettings::soft_max_font_atlases.