autoplot breaks when the key variable contains a space

library(fpp3)
#> ── Attaching packages ──────────────────────────────────────────── fpp3 0.4.0 ──
#> ✓ tibble      3.1.6     ✓ tsibble     1.1.1
#> ✓ dplyr       1.0.8     ✓ tsibbledata 0.4.0
#> ✓ tidyr       1.2.0     ✓ feasts      0.2.2
#> ✓ lubridate   1.8.0     ✓ fable       0.3.1
#> ✓ ggplot2     3.3.5
#> ── Conflicts ───────────────────────────────────────────────── fpp3_conflicts ──
#> x lubridate::date()    masks base::date()
#> x dplyr::filter()      masks stats::filter()
#> x tsibble::intersect() masks base::intersect()
#> x tsibble::interval()  masks lubridate::interval()
#> x dplyr::lag()         masks stats::lag()
#> x tsibble::setdiff()   masks base::setdiff()
#> x tsibble::union()     masks base::union()

us_change %>%
  pivot_longer(c(Consumption, Income), names_to = "Series") %>%
  autoplot(value)

us_change %>%
  pivot_longer(c(Consumption, Income), names_to = "Time Series") %>%
  autoplot(value)
#> Error in `not_tsibble()`:
#> ! x is not a tsibble.

^{Created on 2022-03-03 by the reprex package (v2.0.1)}

tidyverts / fabletools

autoplot breaks when the key variable contains a space #350