Conflict between scale_color_gradient2() and scale_color_manual()

What I want is to remove diffmean legend produced by geom_segment() and scale_color_gradient2() and add legend for both dotted line and solid line (geom_line()). I have tried:

  ggplot2::geom_segment(aes(xend = date, yend = cummeanpcp, color = diffmean), linewidth = 1.2,
                        na.rm = TRUE) +
  ggplot2::scale_color_gradient2(high = "#2c7bb6", mid = "white", low = "#d7191c") +
  ggplot2::geom_line(aes(color = "Cumsumpcp"), linewidth = 0.85, lineend = "round", na.rm = TRUE) +
  ggplot2::geom_line(aes(y = cummeanpcp, color = "Cummeanpcp"), linetype = "longdash", na.rm = TRUE) +
  ggplot2::scale_color_manual(values = c("Cummeanpcp" = "black",
                                         "Cumsumpcp" = "black")) +
  ggthemes::theme_hc(base_size = 15)

But I get:

Scale for colour is already present.
Adding another scale for colour, which will replace the existing scale.
Error: Continuous value supplied to discrete scale

Data:

structure(list(day = c("01", "02", "03", "04", "05", "06", "07", 
"08", "09", "10", "11", "12", "13", "14", "15", "16", "17", "18", 
"19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", 
"30", "31", "01", "02", "03", "04", "05", "06", "07", "08", "09", 
"10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", 
"21", "22", "23", "24", "25", "26", "27", "28", "29", "01", "02", 
"03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", 
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19652, 19653, 19654, 19655, 19656, 19657, 19658, 19659, 19660, 
19661, 19662, 19663, 19664, 19665, 19666, 19667, 19668, 19669, 
19670, 19671, 19672, 19673, 19674, 19675, 19676, 19677, 19678, 
19679, 19680, 19681, 19682, 19683, 19684, 19685, 19686, 19687, 
19688, 19689, 19690, 19691, 19692, 19693, 19694, 19695, 19696, 
19697, 19698, 19699, 19700, 19701, 19702, 19703, 19704, 19705, 
19706, 19707, 19708, 19709, 19710, 19711, 19712, 19713, 19714, 
19715, 19716, 19717, 19718, 19719, 19720, 19721, 19722), class = "Date")), class = c("tbl_df", 
"tbl", "data.frame"), row.names = c(NA, -366L))

My code so far:

ggplot2::ggplot(data = plot_data, aes(x = date, y = cumsumpcp)) +
  ggplot2::geom_segment(aes(xend = date, yend = cummeanpcp, color = diffmean), linewidth = 1.2,
                        na.rm = TRUE) +
  ggplot2::scale_color_gradient2(high = "#2c7bb6", mid = "white", low = "#d7191c") +
  ggplot2::geom_line(linewidth = 0.85, lineend = "round", na.rm = TRUE) +
  ggplot2::geom_line(aes(y = cummeanpcp), linetype = "longdash", na.rm = TRUE) +
  ggthemes::theme_hc(base_size = 15)

Code output:

This is achievable by:

• setting guide = guide_none() in the scale_color_gradient2 call
• setting linetype = "Cumsumpcp" and linetype = "Cummeanpcp" in the two geom_lines
• adding a scale_linetype_manual

library(ggplot2)

ggplot(data = plot_data, aes(x = date, y = cumsumpcp)) +
  geom_segment(aes(xend = date, yend = cummeanpcp, color = diffmean), linewidth = 1.2,
               na.rm = TRUE) +
  scale_color_gradient2(high = "#2c7bb6", mid = "white", low = "#d7191c", guide = guide_none()) +
  geom_line(aes(linetype = "Cumsumpcp"), 
            linewidth = 0.85, 
            lineend = "round", 
            na.rm = TRUE, 
            show.legend = FALSE) +
  geom_line(aes(y = cummeanpcp, linetype = "Cummeanpcp"), na.rm = TRUE) +  
  ggthemes::theme_hc(base_size = 15) +
  scale_linetype_manual(values = c("Cummeanpcp" = "dashed",
                                   "Cumsumpcp" = "solid")) +
  guides(linetype = guide_legend(override.aes = list(
    linewidth = c(0.5, 1),
    lineend = c("square", "round")
  )))