the Arguments "return.MIvalues" in the function factor.scores is no use, when I let it TRUE or FALSE, it's result is same

[ICESDHR]

No description provided.

[ICESDHR]

Don't have extra attributes "zvalues.MI" and "var.zvalues.MI"

[PaulTMcG]

I have the same problem. Here's a reproduce-able example:
set.seed(382)
df <- bind_rows(data.frame(one = sample(c(4, 5), 100, replace = T),
two = sample(c(4, 5), 100, replace = T),
three = sample(c(4, 5), 100, replace = T),
four = sample(c(4, 5), 100, replace = T),
five = sample(c(4, 5), 100, replace = T)),
data.frame(one = sample(c(3, 4, 5), 150, replace = T),
two = sample(c(3, 4, 5), 150, replace = T),
three = sample(c(3, 4, 5), 150, replace = T),
four = sample(c(3, 4, 5), 150, replace = T),
five = sample(c(3, 4, 5), 150, replace = T)),
data.frame(one = sample(c(2, 3, 4), 250, replace = T),
two = sample(c(2, 3, 4), 250, replace = T),
three = sample(c(2, 3, 4), 250, replace = T),
four = sample(c(2, 3, 4), 250, replace = T),
five = sample(c(2, 3, 4), 250, replace = T)),
data.frame(one = sample(c(1, 2, 3), 250, replace = T),
two = sample(c(1, 2, 3), 250, replace = T),
three = sample(c(1, 2, 3), 250, replace = T),
four = sample(c(1, 2, 3), 250, replace = T),
five = sample(c(1, 2, 3), 250, replace = T)),
data.frame(one = sample(c(0, 1, 2), 150, replace = T),
two = sample(c(0, 1, 2), 150, replace = T),
three = sample(c(0, 1, 2), 150, replace = T),
four = sample(c(0, 1, 2), 150, replace = T),
five = sample(c(0, 1, 2), 150, replace = T)),
data.frame(one = sample(c(0, 1), 100, replace = T),
two = sample(c(0, 1), 100, replace = T),
three = sample(c(0, 1), 100, replace = T),
four = sample(c(0, 1), 100, replace = T),
five = sample(c(0, 1), 100, replace = T))
)

fit_df <- grm(df, Hessian = TRUE)
scores_df <- factor.scores.grm(fit_df)
scores_mi_df <- factor.scores.grm(fit_df, method = "MI", B = 10, return.MIvalues = TRUE)