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Issue with `fabletools::model(feasts::STL(index))`

Hi,

Loved your post and now in July trying to learn from it and produce similar results. No matter what I do I can't seem to get that line of code in the subject line to work. First issue was missing data in May but even after I explicitly eliminate it I get the error below... Thanks in advance for your time.

Package dplyr version 1.0.0
Package feasts version 0.1.4
Package fabletools version 0.2.0
Package tsibble version 0.9.1

apple_mobility %>%
  filter(geo_type == "city", date < "2020-04-02") %>%
  select(region:index) %>%
  rename(mode = transportation_type) %>%
  mutate(mode = tools::toTitleCase(mode)) %>%
  filter(region %in% focus_on) %>%
  tsibble::as_tsibble(key = c(region, mode)) %>%
  #  model(classical_decomposition(index)) %>%
  fabletools::model(feasts::STL(index))

results in...

Warning message:
35 errors (35 unique) encountered for feasts::STL(index)
[1] Problem with `mutate()` input `trend`.
x Input `trend` can't be recycled to size 1.
ℹ Input `trend` is `<dbl>`.
ℹ Input `trend` must be size 1, not 80.
ℹ The error occured in group 1: index = 11.42.
[1] Problem with `mutate()` input `trend`.
x Input `trend` can't be recycled to size 1.
ℹ Input `trend` is `<dbl>`.
ℹ Input `trend` must be size 1, not 80.
ℹ The error occured in group 1: index = 12.
[1] Problem with `mutate()` input `trend`.
x Input `trend` can't be recycled to size 1.
ℹ Input `trend` is `<dbl>`.
ℹ Input `trend` must be size 1, not 80.
ℹ The error occured in group 1: index = 13.31.
[1] Problem with `mutate()` input `trend`.
x Input `trend` can't be recycled to size 1.
ℹ Input `trend` is `<dbl>`.
ℹ Input `trend` must be size 1, not 80.

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