adding scale_y_log10 changes y-axis to a weird range

[rxhu]

geom_signif affects scale_y_log10's behavior:

Without scale_y_log10, geom_signif works as expected, e.g.
ggplot(mpg, aes(class, hwy)) + geom_boxplot() +
geom_signif(annotations = c("First", "Second"), y_position = c(30, 40), xmin = c(4, 1), xmax = c(5, 3))

With scale_y_log10, y-axis become extremely large and original plots are squeezed to the bottom
ggplot(mpg, aes(class, hwy)) + geom_boxplot() +
geom_signif(annotations = c("First", "Second"), y_position = c(30, 40), xmin = c(4, 1), xmax = c(5, 3)) + scale_y_log10()