Weird behavior with bind_rows(), mutate(), and ggeffects package

[sschooler]

This is kind of a weird niche problem. The mutate function is interacting strangely with the ggeffects package when using bind_rows to bind multiple ggeffects objects together then using mutate() to add a column (for both functions ggeffect and ggemmeans). It drops rows for seemingly no reason. There is an easy work around, which is simply to wrap bind_rows in data.frame(), but I figured I'd alert devs to the bug. Anyway, here's a reprex using mtcars.

require(dplyr)
require(ggeffects)
data(mtcars)
# create simple linear models
model.fourcyl <- lm(data = mtcars[mtcars$cyl==4,], disp ~ hp)
model.sixcyl <- lm(data = mtcars[mtcars$cyl==6,], disp ~ hp)
model.eightcyl <- lm(data = mtcars[mtcars$cyl==8,], disp ~ hp)
# doesn't work- drops rows beyond row 7
test.df <- bind_rows("FourCyl" = ggemmeans(model.fourcyl, terms = "hp"),
                  "SixCyl" = ggemmeans(model.sixcyl, terms = "hp"),
                  "EightCyl" = ggemmeans(model.eightcyl, terms = "hp"),
                  .id = "group") %>% mutate(pred2 = predicted/10)
# shows the complete data frame
test2.df <- data.frame(bind_rows("FourCyl" = ggemmeans(model.fourcyl, terms = "hp"),
                              "SixCyl" = ggemmeans(model.sixcyl, terms = "hp"),
                              "EightCyl" = ggemmeans(model.eightcyl, terms = "hp"),
                              .id = "group")) %>% mutate(pred2 = predicted/10)

Here's sessionInfo

R version 4.3.2 (2023-10-31 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 11 x64 (build 22631)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.utf8 LC_CTYPE=English_United States.utf8 LC_MONETARY=English_United States.utf8
[4] LC_NUMERIC=C LC_TIME=English_United States.utf8

time zone: America/Los_Angeles
tzcode source: internal

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:
[1] ggeffects_1.3.4 dplyr_1.1.4

loaded via a namespace (and not attached):
[1] Matrix_1.6-1.1 compiler_4.3.2 tidyselect_1.2.0 Rcpp_1.0.12 survey_4.2-1 splines_4.3.2
[7] boot_1.3-28.1 lattice_0.21-9 coda_0.19-4.1 R6_2.5.1 generics_0.1.3 MASS_7.3-60
[13] tibble_3.2.1 nloptr_2.0.3 nnet_7.3-19 insight_0.19.10 DBI_1.2.1 minqa_1.2.6
[19] pillar_1.9.0 rlang_1.1.3 utf8_1.2.4 datawizard_0.10.0 pkgload_1.3.4 estimability_1.4.1
[25] cli_3.6.2 withr_3.0.0 magrittr_2.0.3 emmeans_1.9.0 grid_4.3.2 mvtnorm_1.2-4
[31] xtable_1.8-4 lme4_1.1-35.1 lifecycle_1.0.4 nlme_3.1-163 vctrs_0.6.5 glue_1.7.0
[37] mitools_2.4 survival_3.5-7 carData_3.0-5 fansi_1.0.6 colorspace_2.1-0 tools_4.3.2
[43] pkgconfig_2.0.3 effects_4.2-2