Can't reshape from wide to long for multiple variables

Question

I have been trying to use panelr and then other packages to reshape from wide to long. Here are my variables:

I tried using panelr's long_panel ('merg_Liz_OSARI_MCST' is the name of the dataframe I am using):

panel_long <- merg_Liz_OSARI_MCST %>%
    panelr::long_panel(
    id = "id_number", # existing variable that indexes unique cases
    `wave = "time", # name of the NEW time variable you want
    begin = 1, # first time-related variable suffix in wide data
    end = 3
)

I also tried using older packages:

merge_long <- merg_Liz_OSARI_MCST |>
    pivot_longer(cols = N_negRT_1:num_go_trials_block_2_3,
    names_to = "Variable",
    values_to = "Value")

I also tried:

start_pos <- which(names(merg_Liz_OSARI_MCST) == "N_negRT_1")
end_pos <- which(names(merg_Liz_OSARI_MCST) == "num_go_trials_block_2_3")

# Select the variables to reshape

measure_vars <- names(merg_Liz_OSARI_MCST)[start_pos:end_pos]

# Reshape the data

merge_long <- melt(merg_Liz_OSARI_MCST, na.rm = FALSE, value.name = "time", measure.vars = measure_vars, id.vars = "id_number")

I can't get anything to work. What can I try next?

I have removed all variables that appeared only in wave 1 and 2 but not 3. I also tried ensuring all variables are in the same order for each wave, but this didn't help.