dataset conflicts between packages are not resolved with conflicts

[njtierney]

# remotes::install_github("njtierney/brolgar")
library(brolgar) 

heights
#> # A tsibble: 1,490 x 4 [!]
#> # Key:       country [144]
#>    country     continent  year height_cm
#>    <chr>       <chr>     <dbl>     <dbl>
#>  1 Afghanistan Asia       1870      168.
#>  2 Afghanistan Asia       1880      166.
#>  3 Afghanistan Asia       1930      167.
#>  4 Afghanistan Asia       1990      167.
#>  5 Afghanistan Asia       2000      161.
#>  6 Albania     Europe     1880      170.
#>  7 Albania     Europe     1890      170.
#>  8 Albania     Europe     1900      169.
#>  9 Albania     Europe     2000      168.
#> 10 Algeria     Africa     1910      169.
#> # … with 1,480 more rows

library(modelr)
#> 
#> Attaching package: 'modelr'
#> The following object is masked from 'package:brolgar':
#> 
#>     heights

heights
#> # A tibble: 7,006 x 8
#>    income height weight   age marital  sex    education  afqt
#>     <int>  <dbl>  <int> <int> <fct>    <fct>      <int> <dbl>
#>  1  19000     60    155    53 married  female        13  6.84
#>  2  35000     70    156    51 married  female        10 49.4 
#>  3 105000     65    195    52 married  male          16 99.4 
#>  4  40000     63    197    54 married  female        14 44.0 
#>  5  75000     66    190    49 married  male          14 59.7 
#>  6 102000     68    200    49 divorced female        18 98.8 
#>  7      0     74    225    48 married  male          16 82.3 
#>  8  70000     64    160    54 divorced female        12 50.3 
#>  9  60000     69    162    55 divorced male          12 89.7 
#> 10 150000     69    194    54 divorced male          13 96.0 
#> # … with 6,996 more rows

# there are two datasets with the same name!

# conflicted to help?
library(conflicted)
conflict_prefer("heights", "brolgar")
#> [conflicted] Will prefer brolgar::heights over any other package

# not quite
heights_fit <- lm(height_cm ~ year, heights)
#> Error in eval(predvars, data, env): object 'height_cm' not found

# this works though
heights_fit_b <- lm(height_cm ~ year, brolgar::heights)

^{Created on 2020-09-01 by the reprex package (v0.3.0)}

I was imagining that conflicted would help with resolving datasets, so was hoping that

conflict_prefer("heights", "brolgar")

Would mean that the brolgar::heights would be preferred over modelr::heights.